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The 2000 AudiA6 Quattro comes from the factory with a semi-synthetic SAE 5W-30 oil, meeting Audi's S502 00 oil specification. It costs around $40 for five liters, but this oil is known for longevity and providing great corrosion protection and cold start performance. You will typically need about 7.6 liters to fill a 4.2L engine, so you'll need to buy a few extra quarts along with the initial five liters. Keep in mind that you can choose a different viscosity based on your climate, but it's crucial to select a brand that explicitly states it meets Audi's specifications to avoid voiding your warranty.
The recommended oil for a 2000 Audi A6 Quattro is fully synthetic with a viscosity grade of 5W-40.