What Type of Oil Is Recommended for an Audi A6?

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Audi recommends that customers use synthetic oil with a Society of Automotive Engineers viscosity grade of 5W-40 for normal driving across regular temperature ranges. Customers may substitute SAE 5W-30 or 0W-40 viscosity oil if 5W-40 is not available. These oils are appropriate for all Audi engines, whether gasoline or diesel.