Is the Audi A3 5W-30 or 5W-40? Choosing the Right Oil Explained

The correct oil for an Audi A3 can be either 5W-30 or 5W-40, depending on the model year, engine type (petrol or diesel), regional climate, and—most importantly—the specific Volkswagen/Audi oil specification (such as VW 504 00 / 507 00) required in the owner’s manual or on the under‑hood sticker. In modern Audi A3s, fully synthetic 5W-30 meeting VW 504 00 / 507 00 is the most commonly recommended choice, but some engines—especially older or high‑performance variants—may be better served by 5W‑40 that meets the correct VW spec.

Why the Answer Is “It Depends”

The question of whether the Audi A3 takes 5W-30 or 5W-40 sounds simple, but the real answer hinges on how Audi designs and certifies its engines. Over the past two decades, Audi has updated engine technology, emissions systems, and recommended oil formulations, which means the suitable viscosity has evolved. While 5W-30 is now widely used in newer A3 models, certain engines—particularly older TDI diesels, early TFSI units, and some hotter climates—may call for 5W-40, as long as the correct VW approval is present.

Understanding Oil Viscosity: 5W-30 vs 5W-40

To understand which oil best suits an Audi A3, it helps to break down what 5W-30 and 5W-40 actually mean and how that translates to engine protection and efficiency in everyday driving.

What the Numbers Mean

Motor oil viscosity grades such as 5W‑30 and 5W‑40 follow the SAE (Society of Automotive Engineers) standard. They describe how thick or thin the oil is at cold start and at normal operating temperature, which directly influences wear protection, fuel economy, and performance.

The following list clarifies the meaning of each part of the viscosity rating and how it affects your Audi A3 engine in typical use.

• “5W” (winter grade): Indicates cold‑temperature performance. Both 5W‑30 and 5W‑40 flow similarly at low temperatures, aiding cold starts and initial lubrication.
• “30”: Describes viscosity at operating temperature; 5W-30 is thinner when hot, reducing internal friction and often improving fuel economy.
• “40”: Thicker at operating temperature than a 30‑weight oil, potentially offering a stronger oil film under high load or in very hot conditions.
• Impact on emissions systems: Modern low‑SAPs (low ash) 5W‑30 oils designed for VW 504 00 / 507 00 are optimized to protect particulate filters and catalytic converters.
• Engine age and mileage: Higher‑mileage or slightly worn engines sometimes benefit from 5W‑40’s thicker film, if Audi allows that grade for the specific engine.

In practice, both 5W‑30 and 5W‑40 can protect an Audi A3 engine well when they carry the correct VW approvals; the difference is mostly in high‑temperature film strength versus fuel efficiency and emissions design.

The Crucial Factor: VW/Audi Oil Specifications

For an Audi A3, the official VW/Audi oil specification matters more than the viscosity printed in large numbers on the bottle. These specifications define additive packages, ash content, long‑life performance, and compatibility with emissions equipment.

Key VW Specifications Commonly Seen on Audi A3 Oils

The following list outlines the VW standards most frequently associated with Audi A3 petrol and diesel engines from mid‑2000s models to current generations.

• VW 504 00: Long‑life oil for modern petrol engines. Commonly paired with 5W‑30, suitable for extended service intervals in many newer A3 TFSI models.
• VW 507 00: Long‑life “low‑ash” oil for modern diesel engines with DPF (diesel particulate filters). Again, usually 5W‑30 and mandatory for most Euro 5/Euro 6 TDI A3s.
• VW 502 00 / 505 00: Older‑generation specification for many earlier petrol and diesel engines; often found on 5W‑40 or 5W‑30 fully synthetic oils.
• VW 505 01: A diesel specification previously required for certain unit‑injector (Pumpe‑Düse) TDI engines (more common in older VW/Audi models). Frequently associated with 5W‑40.
• LongLife vs fixed intervals: VW 504 00 / 507 00 typically supports extended “LongLife” service intervals, whereas 502 00 / 505 00 are often used with fixed, shorter intervals.

Matching the VW code on the oil container to the code listed in the Audi A3 owner’s manual or maintenance booklet is the safest and most manufacturer‑correct way to choose between 5W‑30 and 5W‑40.

Typical Recommendations by Generation and Engine Type

While individual markets and model variants can differ, there are broad patterns across Audi A3 generations that help narrow down which viscosity is normally used. Still, the definitive answer always lives in your specific VIN‑matched documentation or an Audi dealer’s system.

First Generation (8L, roughly 1996–2003, varies by market)

Early Audi A3 models were designed before modern low‑ash long‑life formulations became standard, and many used simpler oil specifications with shorter change intervals.

The following list summarizes typical oil tendencies for the first‑generation A3, recognizing that exact requirements depend on engine code and region.

• Petrol engines (1.6, 1.8, 1.8T): Often allowed or recommended fully synthetic 5W‑40 meeting VW 502 00, especially in European climates.
• Diesel TDI engines: Frequently used 5W‑40 meeting VW 505 00 or, in certain Pumpe‑Düse engines, 505 01. Some regions allowed 5W‑30 if it met the same standard.
• Climate considerations: In milder to warm climates, 5W‑40 was commonly favored; extremely cold climates could see recommendations including 0W‑30 or 0W‑40 variants.
• Service intervals: Typically shorter, with less emphasis on long‑life intervals, making the exact viscosity slightly less critical than correct VW approval and regular changes.

For these older A3s, 5W‑40 with the right VW code is often a safe bet, but checking the engine‑code‑specific guidance remains essential.

Second Generation (8P, roughly 2003–2013)

The 8P generation spanned the transition toward long‑life oils and more advanced emissions systems, meaning both 5W‑30 and 5W‑40 saw widespread use depending on engine and year.

The following list highlights how oil choices typically broke down for 8P‑series Audi A3 models.

• Later petrol engines (FSI/TFSI): Commonly recommended 5W‑30 fully synthetic meeting VW 504 00, especially where variable (“LongLife”) servicing was enabled.
• Earlier petrol engines: Might allow both 5W‑30 and 5W‑40, as long as they met VW 502 00; some owners and mechanics preferred 5W‑40 in warmer climates or under spirited driving.
• Diesel TDIs with DPF: Usually required 5W‑30 low‑ash oil meeting VW 507 00 to protect the particulate filter and allow longer intervals.
• Non‑DPF diesels: Sometimes used 5W‑40 with VW 505 00 or 505 01; local dealer guidance and VIN‑specific documentation are important here.

In many 8P A3s—especially later models—the factory guidance shifted strongly toward 5W‑30 long‑life oils, but there remain numerous exceptions that must be verified by specification, not just viscosity.

Third Generation (8V, roughly 2012–2020)

With the 8V A3, Audi more firmly standardized on low‑ash, long‑life 5W‑30 oils for both petrol and diesel variants, in line with tightening emissions regulations and engine efficiency targets.

The following list outlines general oil practices for the 8V generation across common engine types.

• Petrol TFSI engines (1.0, 1.4, 1.5, 1.8, 2.0 TFSI): Typically factory‑filled and serviced with 5W‑30 fully synthetic oil meeting VW 504 00, suitable for long‑life intervals.
• Diesel TDI engines (1.6, 2.0 TDI): Commonly require 5W‑30 low‑SAPs oil meeting VW 507 00, essential for DPF protection and extended service spacing.
• S3 and performance variants: In many markets, still specified for 5W‑30 with VW 504 00, though some owner communities and independent specialists advocate 5W‑40 meeting the same or compatible specs for hard track use in hot climates.
• Regional variations: North American and European manuals can differ slightly in allowable alternative viscosities (e.g., 0W‑30, 0W‑40), but 5W‑30 remains the default.

For most everyday 8V A3 owners, a high‑quality 5W‑30 that explicitly lists VW 504 00 / 507 00 on the label is the manufacturer‑correct choice.

Fourth Generation (8Y, from around 2020 onward)

The current 8Y generation continues Audi’s commitment to highly efficient engines and strict emissions controls, making low‑ash 5W‑30 oils the mainstream recommendation.

The following list summarizes how oil selection typically works in the latest Audi A3 models.

• Latest petrol engines (e.g., 1.0, 1.5, 2.0 TFSI, including mild‑hybrid variants): Generally specified for fully synthetic 5W‑30 with VW 504 00, optimized for fuel economy and emissions.
• Current diesel engines (where offered): Usually require 5W‑30 meeting VW 507 00, critical for modern DPF systems and Euro 6–level standards.
• S3 / RS3 performance versions: Frequently still based around 5W‑30 (with VW 504 00), but may list alternative higher‑viscosity grades (5W‑40, 0W‑40) for severe or track conditions—always check the specific performance supplement or dealer data.
• Service plans and warranties: Using oil that lacks the correct 504 00 / 507 00 approval may risk warranty coverage on new vehicles, even if the viscosity seems “close enough.”

For 8Y owners, the viscosity question is usually straightforward: 5W‑30 with the correct VW approval is the default, and any deviation should be explicitly allowed by the manufacturer documentation.

When 5W-40 Might Be Appropriate

Even with the trend toward 5W‑30, there are scenarios where 5W‑40—again, with the correct VW spec—can be a rational or manufacturer‑approved choice for certain Audi A3 engines.

Common Situations Favoring 5W-40

The following list describes circumstances in which 5W‑40 may be considered or permitted, subject to Audi’s official guidance for that engine.

• Older A3 models: Early petrol and diesel engines, especially pre‑DPF, often originally specified or allowed 5W‑40 with VW 502 00 / 505 00 / 505 01.
• High‑mileage engines: Engines that show increased oil consumption or wear may benefit from the slightly thicker hot‑temperature viscosity of 5W‑40, if the manual lists it as an alternate grade.
• Hot climates and heavy loads: In sustained high‑temperature driving, towing, or frequent high‑speed highway use, a VW‑approved 5W‑40 can sometimes provide extra thermal margin.
• Performance/track use: For turbocharged performance variants driven aggressively, some enthusiasts and tuners prefer 5W‑40 for added protection, but this should be balanced against Audi’s official recommendations, especially on newer engines.
• Non‑DPF diesels: Where no particulate filter is fitted and the manual allows it, 5W‑40 oils with older VW diesel specs are still widely used.

In any of these cases, the crucial condition remains that the chosen 5W‑40 must display the correct VW approval for your specific A3 engine and region, rather than merely matching viscosity.

How to Check What Your Specific Audi A3 Needs

Because there are many engine codes, markets, and updates across the Audi A3 range, identifying the exact requirement for your car is essential before buying oil or topping up.

Steps to Verify the Correct Oil

The following list outlines practical ways to confirm whether your Audi A3 should use 5W‑30, 5W‑40, or another variant, and which VW spec is mandatory.

1. Consult the owner’s manual: Go to the “Engine oil” or “Fluids” section; it will list the required VW specification (e.g., 504 00 / 507 00) and typically a default viscosity such as 5W‑30.
2. Check under‑bonnet stickers: Many A3s have a label near the engine bay or oil filler cap showing the required VW standard, sometimes with approved viscosity ranges.
3. Use the VIN at an Audi dealer: Dealer service departments can pull up the exact engine code and oil spec tied to your VIN, including any technical service bulletins that may have updated recommendations.
4. Use reputable online parts catalogs: Many OEM and major aftermarket sites allow VIN or model/engine selection and then show oils that meet the exact VW specifications.
5. Match the label, not just the grade: When buying oil, confirm the VW code (e.g., “VW 504 00 / 507 00 approved”) is printed clearly on the bottle; “suitable for” is not as strong as “meets” or “approved to.”

By following these steps, you avoid relying solely on generic advice and ensure that the oil you choose—whether 5W‑30 or 5W‑40—meets Audi’s technical requirements for your particular vehicle.

Practical Recommendation

For most modern Audi A3 owners, especially with 8V and 8Y models, a fully synthetic 5W‑30 oil carrying VW 504 00 (petrol) and/or 507 00 (diesel) approval is the correct and safest default. Drivers of older A3s, particularly early diesels or high‑mileage examples, may appropriately use 5W‑40 if it matches the VW specification in the manual.

Summary

The Audi A3 does not universally take either 5W‑30 or 5W‑40; both grades are used depending on model year, engine, emissions equipment, climate, and service regime. Modern A3s typically specify fully synthetic 5W‑30 oils with VW 504 00 / 507 00 approvals, reflecting Audi’s emphasis on efficiency and emissions compatibility. Older or high‑mileage engines, and some performance or hot‑climate applications, may legitimately use 5W‑40—provided it carries the exact VW specification listed in the vehicle’s documentation. The decisive step is always to match the oil’s VW approval code to what Audi requires for your specific engine, using viscosity as a secondary criterion rather than the primary one.

What engine oil to use for Audi A3?

The Audi A3 oil type depends on the model year, but common recommendations include 5W-30, 5W-40, or 0W-20, with 5W-30 being a frequent choice for many models. It is crucial to consult your owner’s manual or the oil filler cap for the specific viscosity and, most importantly, the required oil quality specification (like VW 502 00 or VW 508 00) for your engine.
 
Common Audi A3 oil types

• 5W-30: A very common and often recommended oil for many A3 engines, suitable for a wide range of temperatures. 
• 5W-40: An excellent choice for warmer climates or turbocharged engines, providing extra protection. 
• 0W-20: Often specified for newer models with specific engine designs, especially those with the B-Cycle engine. 

How to choose the right oil

1. Check your owner’s manual: This is the definitive source for your vehicle’s specific requirements. 
2. Look at the oil filler cap: Many caps have the recommended viscosity printed on them. 
3. Match the oil quality standard: Simply matching the viscosity isn’t enough. The oil must meet a specific Audi/VW quality standard (e.g., VW 502 00 or VW 508 00). 
4. Consider your climate: While 5W-30 is common, 5W-40 might offer better protection in very hot weather, while 0W-30 can be better in very cold weather. 
5. Use full synthetic: For most modern Audi engines, a full synthetic oil is the best choice for optimal performance and protection. 

Can I use 5W-30 in my Audi A3?

Oil Viscosity Recommendations
Audi A3 engines typically require: SAE 5W-30: Ideal for a wide range of temperatures and common for most Audi engines.

Is 5W30 good for Audi?

The recommended oil type is 5w-40 synthetic. While 5w-30 can work in a pinch, it’s best to use 5w-40 if you have it available. Yes, using Mobile One is perfectly acceptable.

Can I use 5W40 instead of 5W30 for Audi?

As an emergency measure yes 5w40 is ok.