Audi A4 Engine Oil: Complete Guide to Oil Type, Specs, Levels, and Changes

Choosing the right Audi A4 engine oil sounds simple until we stand in front of a shelf packed with 0W-20, 0W-30, 5W-30, synthetic blends, full synthetics, and enough manufacturer specifications to make our heads spin. The Audi A4 has been sold with several petrol and diesel engines across multiple generations, so there is no single bottle of oil that is automatically correct for every A4 ever made.

That distinction matters.

Using oil with the correct viscosity is important, but viscosity is only half the story. Audi and Volkswagen Group engines also rely heavily on specific VW oil approvals, such as VW 502 00, VW 504 00, VW 505 00, VW 507 00, and newer specifications used by more recent engines. Two oils can both say 5W-30 on the front and still be very different choices for the same Audi.

In this guide, we'll break down Audi A4 oil types, viscosity grades, oil specifications, capacity, checking procedures, change intervals, consumption, warning signs, and common mistakes. Think of engine oil as the bloodstream of the engine: it lubricates, cools, cleans, protects, and carries contaminants away from components that would otherwise grind themselves into an expensive repair bill.

What Engine Oil Does an Audi A4 Use?

The correct Audi A4 engine oil depends primarily on the model year, engine code, fuel type, emissions equipment, and applicable Volkswagen oil specification.

Many Audi A4 models use fully synthetic oil in viscosities such as:

• 0W-20
• 0W-30
• 5W-30
• 5W-40

However, we shouldn't choose oil simply because one of those viscosity grades appears on another owner's A4.

A turbocharged petrol A4 from one generation may require a different VW approval from a later mild-hybrid model. A diesel A4 fitted with a diesel particulate filter can also need low-ash oil specifically designed to protect its emissions system.

The safest rule is straightforward: match the oil to the specification stated for the exact vehicle, not merely to the words "Audi A4."

Why the VW Oil Specification Matters More Than the Brand

It is easy to focus on familiar oil brands. We might trust Castrol, Mobil, Shell, Liqui Moly, Motul, or another established manufacturer and assume any premium synthetic product will work.

That's not quite how Audi oil selection works.

Audi belongs to Volkswagen Group, and many engines are engineered around defined VW lubricant standards. Those approvals cover characteristics that go well beyond viscosity, including oxidation resistance, deposit control, wear protection, compatibility with emissions equipment, and performance under specific service conditions.

Common VW Specifications Seen on Audi A4 Models

Depending on generation and engine, we may encounter specifications including:

VW 502 00
Commonly associated with certain petrol engines using conventional fixed service intervals.

VW 504 00
A later specification widely associated with many petrol engines and extended-service applications.

VW 505 00 / 505 01
Found on certain older diesel applications, depending on engine design.

VW 507 00
Frequently used with diesel engines equipped with particulate filters and long-life servicing requirements.

Newer Audi engines may use more recent VW specifications, so we should always consult the owner's manual, service information, or oil specification label applicable to the exact vehicle.

Approval Beats "Suitable For" Marketing

There is another subtle detail worth watching.

An oil bottle may say that the product is "recommended for," "suitable for," or "meets the requirements of" a VW specification. That isn't necessarily identical to carrying a formal manufacturer approval.

Whenever possible, we prefer an oil that explicitly lists the required VW approval.

Audi A4 Engine Oil Viscosity Explained

Those numbers on the bottle aren't random.

Take 5W-30 as an example.

The first number followed by "W" describes how the oil behaves at lower temperatures. The second number represents its viscosity characteristics when the engine reaches operating temperature.

What Does 0W-20 Mean?

A 0W-20 oil flows readily during cold starts while remaining within its designated viscosity range at operating temperature.

Modern engines may use thinner oils to reduce internal friction and improve efficiency. But thinner does not automatically mean less protective. A correctly formulated oil designed for the engine can deliver excellent wear protection despite appearing remarkably light compared with older lubricants.

What Does 5W-30 Mean?

5W-30 has been widely used across modern European vehicles. It provides good cold-flow characteristics and maintains appropriate viscosity once hot.

Still, seeing 5W-30 in one Audi A4 doesn't mean every 5W-30 product is interchangeable. VW approval remains essential.

What About 5W-40?

Some A4 petrol engines, especially from older generations or under particular service schedules, can use approved 5W-40 oils.

Owners sometimes move toward a slightly heavier oil hoping to reduce oil consumption in an aging engine. That can occasionally alter consumption, but changing viscosity should not become a substitute for diagnosing mechanical wear, leaks, PCV faults, or turbo-related issues.

Synthetic Oil vs Conventional Oil in an Audi A4

For most modern Audi A4 engines, full synthetic oil is the sensible and often required choice.

Turbocharged engines create substantial heat. The oil circulating through turbocharger bearings experiences conditions far harsher than those encountered in a leisurely naturally aspirated engine from decades ago.

Synthetic oils generally provide stronger resistance to:

• High-temperature breakdown
• Sludge formation
• Oxidation
• Cold-start thickening
• Deposit buildup
• Turbocharger coking

Using a cheap conventional oil in an engine designed around a sophisticated synthetic lubricant is a bit like fitting hiking boots to a racing cyclist. Technically, something is covering the feet, but we've missed the entire engineering brief.

Audi A4 Petrol Engine Oil

Audi A4 petrol engines have included numerous naturally aspirated and turbocharged configurations over the years, although turbocharged TFSI engines have become particularly prominent.

The correct oil varies between generations.

Oil for Audi A4 TFSI Engines

TFSI engines combine turbocharging with direct fuel injection, placing significant demands on engine oil.

The lubricant must protect:

• Turbocharger bearings
• Timing components
• Camshafts
• Pistons
• Cylinder walls
• Hydraulic systems
• Variable valve timing mechanisms

Deposits matter too. Turbocharged direct-injection engines generate high temperatures, and poor-quality or incorrect oil can contribute to sludge and varnish formation.

We therefore place the official VW specification above vague claims such as "European formula" or "for German cars."

Audi A4 Diesel Engine Oil

Diesel A4 models require equally careful oil selection.

Many newer diesel engines use a diesel particulate filter (DPF). The DPF captures soot from exhaust gases and periodically burns it away through regeneration.

Some engine oils leave higher levels of metallic ash when burned. Over time, that ash can accumulate inside the particulate filter.

Why Low-SAPS Oil Matters

Low-SAPS oils contain controlled levels of:

• Sulphated ash
• Phosphorus
• Sulfur

These formulations are designed to work more harmoniously with modern exhaust after-treatment systems.

Where an A4 TDI requires a specification such as VW 507 00, pouring in a random diesel-rated oil because it has the same viscosity can be a false economy.

A DPF is vastly more expensive than a proper bottle of oil.

How Much Engine Oil Does an Audi A4 Take?

There is no universal Audi A4 oil capacity.

Depending on the engine, capacity can broadly fall around the 4- to 6-liter range, though some versions can sit outside that window.

More importantly, oil capacities can differ based on:

• Engine displacement
• Engine code
• Model year
• Whether the filter is replaced
• How thoroughly the old oil drains
• Vehicle configuration

We shouldn't fill an engine based solely on an approximate internet figure.

Why Oil Capacity Figures Aren't Always Exact in Practice

Suppose the listed capacity is 5 liters.

That doesn't necessarily mean we should immediately pour five liters into the engine after draining it.

Some oil may remain trapped in internal passages. The quantity removed may also vary depending on engine temperature and how long the vehicle drains.

A better approach is to add slightly less than the nominal capacity, check the level correctly, and top up gradually.

Overfilling can be nearly as troublesome as running low.

How to Check Audi A4 Engine Oil

Different Audi A4 generations use different oil-level systems.

Some have a traditional dipstick, while others rely heavily—or entirely—on an electronic oil-level display.

Checking Oil With a Dipstick

For vehicles equipped with one:

1. Park the Audi on level ground.
2. Allow the engine to reach the appropriate checking condition.
3. Switch the engine off.
4. Wait several minutes for oil to drain into the sump.
5. Remove the dipstick.
6. Wipe it clean.
7. Reinsert it fully.
8. Remove it again and read the level.

We want the oil between the minimum and maximum marks.

It doesn't need to be sitting exactly on maximum.

Checking Audi A4 Oil Electronically

Depending on the infotainment generation, oil level may be accessible through a vehicle or servicing menu.

Electronic measurements typically require certain conditions before providing a valid reading, such as:

• Level ground
• Warm engine
• Engine switched off for a specified period
• Ignition switched on

If the system says an oil-level measurement is unavailable, that doesn't necessarily indicate a fault. Often the required measuring conditions simply haven't been met.

How Often Should We Change Audi A4 Engine Oil?

Audi service intervals vary according to market, model, year, oil specification, and whether the vehicle operates under fixed or flexible servicing.

Some factory schedules allow relatively long intervals with approved long-life oils.

Yet the perfect laboratory-style service interval and real-world ownership aren't always the same thing.

Driving Conditions Matter

Oil ages faster when we regularly experience:

• Short journeys
• Heavy traffic
• Repeated cold starts
• High engine loads
• Hot climates
• Dusty environments
• Frequent towing
• Extended idling

A car driven 15,000 kilometers almost entirely on open highways isn't living the same life as one covering that distance two kilometers at a time through stop-start traffic.

Should We Change Audi Oil Earlier Than Audi Says?

There is no need to panic and replace good oil every few thousand kilometers.

At the same time, owners who plan to keep their A4 for many years often choose somewhat shorter intervals than the longest factory-permitted schedule, especially on turbocharged engines.

Fresh oil is comparatively inexpensive insurance.

The important thing is not to exceed the applicable maintenance requirements and to use the correct approved oil each time.

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Audi A4 Oil Filter Replacement

An engine oil service should normally include replacement of the oil filter.

The filter captures microscopic contamination circulating through the lubrication system.

Leaving an old filter installed after replacing the oil is like taking a shower and putting dirty clothes straight back on.

Why Filter Quality Matters

A quality oil filter has to do more than trap dirt. It must also maintain appropriate flow and bypass characteristics.

An unsuitable filter can potentially create issues with:

• Oil pressure
• Cold-start lubrication
• Filtration efficiency
• Internal leakage

OEM or reputable aftermarket filters designed specifically for the engine are generally preferable to anonymous bargain filters.

Signs Your Audi A4 Engine Oil Is Low

A low oil level isn't something we want to discover after the engine begins making mechanical noises.

Potential signs include:

• Oil-level warning message
• Low-oil warning light
• Increasing oil consumption
• Burning-oil smell
• Visible oil leaks
• Unusual engine ticking
• Oil spots beneath the vehicle

Not every warning means the same thing, however.

Low Oil Level vs Low Oil Pressure

This distinction is crucial.

An oil-level warning generally means there isn't enough oil in the engine and the level should be checked.

An oil-pressure warning can indicate that the engine is not receiving adequate lubrication pressure.

Those are very different situations.

Why Low Oil Pressure Is Serious

Engine bearings rely on a thin pressurized film of oil to keep metal surfaces separated.

Lose that film and components can begin contacting each other directly.

At thousands of revolutions per minute, damage can occur rapidly.

If a genuine red oil-pressure warning appears while driving, continuing onward because "the engine still sounds fine" can turn a manageable problem into catastrophic engine failure.

Why Does My Audi A4 Use Engine Oil?

All internal-combustion engines consume some amount of oil. The question is whether the amount is normal.

Some Audi engines and generations have developed reputations for higher oil consumption than owners expected.

Potential causes include:

• Piston ring wear
• Cylinder wear
• Valve stem seal deterioration
• PCV system problems
• Turbocharger seal issues
• External leaks
• Incorrect oil
• High operating loads

A Little Consumption Doesn't Automatically Mean Engine Failure

Oil consumption can vary with driving style.

A turbocharged engine driven hard on long motorway journeys may consume more oil than the same car used gently.

Temperature, mileage, engine condition, and viscosity can all influence consumption.

The meaningful measure is the rate of consumption over distance.

Track Consumption Instead of Guessing

If we suspect excessive oil use, record:

• Mileage when topped up
• Quantity added
• Mileage at next top-up
• Any warning messages
• Visible smoke
• Leak evidence

That simple log gives us something objective to work with instead of relying on memory.

Common Audi A4 Engine Oil Leaks

Oil leakage becomes more likely as rubber seals and gaskets age.

Common leak areas can vary by engine but may include:

• Valve cover gasket
• Oil filter housing
• Oil cooler seals
• Timing cover areas
• Oil pan
• Turbocharger oil lines
• Crankshaft seals

Why Small Oil Leaks Shouldn't Be Ignored

A minor leak may begin as nothing more than a damp patch.

Then heat, pressure, and aging widen the problem.

Oil can reach exhaust components and create burning smells. It may also contaminate belts, mounts, wiring, or underbody components.

A small leak today can become a messy—and costly—repair later.

Can We Mix Different Engine Oils in an Audi A4?

In an emergency, topping up with compatible oil is generally better than knowingly running the engine dangerously low.

But routinely mixing random oils isn't ideal.

If possible, match:

1. Required VW specification
2. Recommended viscosity
3. Oil type
4. Existing product

Different reputable oils can often mix physically, but the resulting blend may no longer provide exactly the performance profile intended by either formulation.

For routine maintenance, consistency is preferable.

Can We Use a Different Oil Viscosity?

This is one of the most common Audi A4 oil questions.

Perhaps the vehicle calls for 0W-30, but we have 5W-30 sitting in the garage.

Can we use it?

The answer depends on whether that alternative viscosity is officially permitted for the engine and whether it carries the required VW specification.

Don't Choose Oil Based Only on Climate

A familiar old rule says we should simply run thicker oil in hot climates.

Modern engine design is more sophisticated than that.

Oil viscosity influences hydraulic actuators, variable valve timing systems, bearing clearances, oil pumps, efficiency, and turbocharger lubrication.

Climate matters, but factory approvals matter more.

What Happens If We Put Too Much Oil in an Audi A4?

Overfilling is not harmless.

When the oil level rises too far, moving crankshaft components can churn the oil into foam.

Foamy oil doesn't lubricate as effectively as a stable liquid film.

Excessive oil can also place additional stress on the crankcase ventilation system and contribute to oil entering the intake.

Possible symptoms include:

• Smoke
• Rough running
• Oil leaks
• Increased crankcase pressure
• Warning messages
• Catalytic converter contamination

If we've significantly overfilled the engine, removing the excess is safer than hoping it burns away.

What Happens If the Audi A4 Runs Low on Oil?

Running below the correct oil level reduces the amount of lubricant available for cooling and protection.

As the level falls, oil temperature can rise and aeration can become more likely during cornering or braking.

Eventually, pressure may become unstable.

Potential damage can involve:

• Turbocharger
• Main bearings
• Connecting rod bearings
• Camshafts
• Timing components
• Pistons
• Cylinder walls

Engine oil costs tens of dollars.

An engine costs thousands.

That comparison makes regular level checks look remarkably attractive.

Does Audi A4 Engine Oil Go Bad With Age?

Yes.

Mileage isn't the only factor that degrades oil.

Oil also deteriorates through:

• Oxidation
• Fuel dilution
• Moisture contamination
• Combustion by-products
• Additive depletion
• Thermal cycling

This is why maintenance schedules usually contain both distance and time limits.

A low-mileage A4 that spends months making short journeys can still need annual servicing.

Short Trips Can Be Surprisingly Hard on Oil

A ten-minute journey feels gentle because the engine isn't being driven aggressively.

In reality, repeated short journeys can prevent the oil from staying hot long enough to evaporate accumulated moisture and fuel dilution.

So the apparently easy life can sometimes be the tougher one.

Best Engine Oil for a High-Mileage Audi A4

Once an A4 crosses 100,000 miles or 160,000 kilometers, owners often wonder whether they should automatically switch to high-mileage oil.

Not necessarily.

Mileage alone doesn't determine the correct lubricant.

A healthy 180,000-kilometer engine may still perform beautifully on the same approved specification it has used throughout its life.

When High-Mileage Oil Might Help

Some high-mileage formulations contain additives designed to support aging seals and reduce volatility.

They may be useful in certain worn engines, but we still need the correct Audi/VW specification.

We wouldn't sacrifice manufacturer approval just to get a bottle with "high mileage" printed across the front.

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How to Choose Audi A4 Engine Oil Step by Step

When buying oil, we can simplify the entire process into one logical sequence:

1. Identify the exact Audi A4 model year.
2. Identify the engine and fuel type.
3. Check the owner's manual or manufacturer specification.
4. Find the required VW oil approval.
5. Check the permitted viscosity grade.
6. Choose a reputable oil carrying that approval.
7. Buy enough for the full service plus a small amount for future topping up.
8. Use a quality oil filter.
9. Verify the oil level after filling.
10. Record the date and mileage of the change.

That approach eliminates most oil-selection confusion.

Audi A4 Oil Change: DIY or Workshop?

Changing oil on an Audi A4 is entirely possible for experienced DIY owners, but modern cars can make the job less straightforward than it first appears.

Access panels, electronic oil measurement, cartridge filters, torque requirements, and service-reset procedures can add complexity.

Advantages of a DIY Oil Change

Doing the job ourselves gives us control over:

• Oil brand
• Exact specification
• Filter quality
• Drain time
• Workmanship

It can also save money.

Advantages of Professional Servicing

A good workshop can inspect the vehicle for issues we might otherwise miss, including:

• Oil leaks
• Coolant leaks
• Worn suspension parts
• Damaged undertrays
• Brake wear
• Belt deterioration
• Fault codes

The smartest choice depends on our mechanical confidence and equipment.

Common Audi A4 Oil Change Mistakes

Engine oil servicing isn't difficult, but small mistakes matter.

Using Oil With the Wrong VW Approval

This is probably the most important mistake to avoid.

Matching viscosity alone isn't enough.

Overtightening the Drain Plug

More torque isn't more secure.

Excessive force can damage the oil pan or threads, turning a simple service into a repair.

Reusing Seals That Should Be Replaced

Drain plug washers and certain filter housing seals are inexpensive.

Oil leaks aren't.

Installing the Oil Filter Incorrectly

An incorrectly seated O-ring can leak immediately—or several miles later.

Always follow the filter manufacturer's installation method.

Overfilling the Engine

We don't need to reach beyond the maximum mark "for extra protection."

The maximum mark is a limit, not a target to exceed.

Should We Check Audi A4 Oil Between Services?

Absolutely.

Even a perfectly healthy engine can consume some oil between scheduled maintenance visits.

Checking periodically allows us to catch changes before they become warnings.

A sensible habit is to check:

• Before long journeys
• Every few fuel fill-ups on older vehicles
• After buying a used A4
• After repair work
• Whenever an oil warning appears

Knowing our car's normal consumption pattern is useful. Once we establish a baseline, unusual behavior becomes much easier to spot.

Audi A4 Engine Oil and Turbocharger Health

Most modern A4 engines are turbocharged, which makes oil quality particularly important.

A turbocharger can spin at extraordinarily high speeds while operating beside red-hot exhaust gases.

Oil lubricates and cools its bearings.

Poor lubrication can contribute to:

• Bearing wear
• Shaft play
• Oil leakage
• Turbo noise
• Smoke
• Performance loss

Why Cold Starts Matter

When an engine first starts, oil must reach critical components quickly.

This is one reason the correct cold-viscosity rating matters.

We also don't need to rev the engine aggressively immediately after startup. Normal, moderate driving lets oil temperature rise progressively.

What About Cooling the Turbo Before Shutdown?

Modern turbocharged road cars generally manage normal shutdown conditions well.

After ordinary driving, extended idling is usually unnecessary.

After unusually hard operation, however, giving the engine a brief period of gentler driving before switching off can reduce thermal stress.

Does Engine Oil Affect Audi A4 Fuel Economy?

Yes, although the difference is usually modest.

Oil creates internal resistance as engine components move through and pump it.

Manufacturers increasingly use low-viscosity oils partly to reduce friction and improve efficiency.

That doesn't mean we should pour the thinnest oil available into the engine.

Fuel economy gains only make sense when the oil is approved for that specific engine.

Can Wrong Engine Oil Trigger Warning Lights?

Potentially.

Incorrect oil can influence lubrication pressure, oil temperature, emissions systems, or hydraulic engine functions depending on the situation.

However, if a warning appears immediately after an oil service, we should first check straightforward possibilities such as:

• Incorrect oil level
• Loose oil cap
• Oil leak
• Filter installation problem
• Disconnected sensor
• Incorrect service reset

Never assume the warning is harmless just because it appeared after maintenance.

Buying a Used Audi A4? Check Its Oil History

A service history tells us more than whether someone remembered to visit a garage.

Oil maintenance gives clues about how the engine has been treated throughout its life.

Look for evidence of regular oil and filter changes.

Red Flags in a Used Audi A4

We'd pay closer attention if we find:

• Long gaps between services
• No maintenance documentation
• Extremely dark sludge beneath the oil cap
• Low oil at inspection
• Blue exhaust smoke
• Burning-oil smell
• Active oil-pressure warning
• Major leaks
• Frequent unexplained top-ups

A spotless exterior can't compensate for an engine that has spent years running neglected oil.

How Much Should an Audi A4 Oil Change Cost?

Oil-change pricing varies dramatically by country, engine, workshop type, and oil capacity.

Dealership servicing is often more expensive than independent specialist servicing because labor rates and genuine parts pricing tend to be higher.

What matters most isn't finding the absolute cheapest service.

We want confirmation that the workshop is using:

• Correct oil specification
• Correct quantity
• Quality filter
• Appropriate replacement seals
• Correct torque procedures

Saving a modest amount by using unsuitable oil is rarely a good trade.

Should We Flush the Engine During an Oil Change?

Engine flush products remain controversial.

On a well-maintained Audi receiving regular oil changes, aggressive chemical flushing is usually unnecessary.

Modern engine oil already contains detergents and dispersants designed to control deposits.

On heavily neglected engines, strong flushing products can sometimes loosen accumulated debris rapidly, which isn't always desirable.

If sludge is suspected, diagnosis should come before experimentation.

How to Keep Audi A4 Engine Oil Healthy for Longer

We can't stop oil from aging, but we can reduce unnecessary stress.

Good habits include:

• Using the exact approved oil specification
• Changing oil on schedule
• Replacing the filter each service
• Avoiding aggressive acceleration immediately after cold starts
• Checking the oil level regularly
• Repairing leaks early
• Investigating abnormal consumption
• Keeping the cooling system healthy

Oil isn't working alone. Excessive engine temperature, poor combustion, fuel dilution, and mechanical wear can all shorten its useful life.

The Bottom Line on Audi A4 Engine Oil

Choosing Audi A4 engine oil doesn't have to feel like deciphering a chemistry textbook.

The key is to stop thinking in terms of one universal "best oil" and instead find the oil that matches the exact engine.

Start with the manufacturer's required VW specification, then confirm the appropriate viscosity. Use a quality synthetic lubricant where required, replace the filter at each oil service, maintain the proper level, and investigate unusual consumption rather than simply pouring another liter into the engine every time a warning appears.

The Audi A4's turbocharged engines are sophisticated pieces of machinery. They can deliver strong performance, impressive efficiency, and long service lives, but lubrication isn't an area where shortcuts make sense.

A bottle of the correct oil is one of the cheapest pieces of preventive maintenance we can buy.

Frequently Asked Questions About Audi A4 Engine Oil

1. What oil should I use in my Audi A4?

The correct oil depends on the Audi A4's model year and engine. Many versions use synthetic oils such as 0W-20, 0W-30, 5W-30, or 5W-40, but the required VW approval is more important than viscosity alone. Check the owner's manual or official specification for the exact engine.

2. Can I use 5W-30 in an Audi A4?

Many Audi A4 engines can use 5W-30, but not every A4 is designed for it. The oil must also carry the Volkswagen specification required by the engine. Never assume all 5W-30 oils are interchangeable.

3. How often does an Audi A4 need an oil change?

Oil-change intervals vary by generation, engine, market, and service schedule. Follow the maintenance interval specified for the vehicle and consider more frequent changes when the car experiences repeated short trips, heavy traffic, harsh temperatures, or demanding use.

4. Why is my Audi A4 losing engine oil?

Oil loss can result from normal consumption, external leaks, PCV system faults, worn piston rings, valve seals, or turbocharger problems. Tracking how much oil the engine consumes over a measured distance can help determine whether the rate is abnormal.

5. What happens if I put too much oil in my Audi A4?

Significant overfilling can cause oil aeration, increased crankcase pressure, smoke, leaks, and potential damage to emissions components. If the level is above the specified maximum, remove the excess rather than driving indefinitely with an overfilled sump.

Conclusion

The best Audi A4 engine oil is not necessarily the most expensive bottle on the shelf, the thickest oil, or even the brand with the cleverest marketing. It is the lubricant engineered to meet the specific VW approval and viscosity requirements of our particular A4 engine.

Once we understand that principle, everything becomes easier. We can choose oil confidently, recognize questionable recommendations, monitor consumption intelligently, and protect expensive components such as the turbocharger and timing system.

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Regular oil maintenance may not be the most exciting part of Audi ownership, but it is one of the most important. Keep clean, correctly specified oil flowing through the engine, and we've already done one of the best things possible for long-term reliability.

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