The oil for a 2018 Audi A3 isn't a one-size-fits-all answer. The exact grade depends on the engine in your car; Audi requires fully synthetic motor oil that meets Volkswagen Group approvals. In practice, most petrol A3s call for 0W-20, while diesel variants often require 5W-30 or 5W-40 with long-life standards. Always verify the specification in your owner's manual or on the oil filler cap.
Oil options by engine type
The 2018 A3 was offered with multiple engines, each with its own oil specification. The following guide provides typical oil grades and approvals you’ll encounter on common A3 engines. Variations by market or model year can apply, so use this as a guide and confirm with the manual.
- Gasoline engines (TFSI): Most 2018 A3 petrol engines are designed for a fully synthetic oil in the 0W-20 family. Some variants tolerate or require 5W-30, depending on power output and emission controls. Look for oil meeting Volkswagen Group approvals (the exact spec is listed in the owner’s manual or on the oil cap).
- Diesel engines (TDI): The 2.0 TDI variants typically require a fully synthetic oil in the 5W-30 to 5W-40 range with long-life approvals suitable for diesel engines with a particulate filter. The official VW/Audi specification will be printed in the manual or on the engine bay label.
Concluding guidance: The precise oil specification is engine-specific. Do not rely on a single grade for all 2018 A3s.
How to confirm the exact specification for your car
To be certain, follow these steps to verify the right oil for your specific A3:
- Check the engine code and model year in the owner’s manual or on the under-hood label—the code determines the exact oil spec needed.
- Inspect the oil filler cap and maintenance booklet, which often list the required viscosity and VW Group approvals.
- Consult Audi or VW official service databases, or contact a dealer with your VIN for the precise specification and approved brands.
- If you must decide without documentation, choose a fully synthetic oil with a viscosity appropriate for your engine (commonly 0W-20 for petrol and 5W-30 or 5W-40 for diesel) and ensure it carries the VW Group approvals indicated in your manual.
Following these steps will ensure you’re using the oil specified by the manufacturer for your A3.
Summary
The 2018 Audi A3 uses fully synthetic motor oil, but the exact grade and VW/Audi approvals vary by engine. Most petrol 2018 A3s use 0W-20, while diesel variants typically require 5W-30 or 5W-40 with long-life approvals. Always verify the exact specification in the owner’s manual or with an Audi/VW dealer; using the correct oil protects the engine and helps maintain warranty coverage.