What is the best oil for an Audi 80 engine?

I recently bought an old Audi 80 and I'm not sure what type of oil to use for the engine. Can anyone recommend the best oil and how often I should change it?

Personally, I would recommend using a fully synthetic oil with a high viscosity rating, such as 5W-40. This will provide optimal protection for the engine, especially if it has high mileage. As for how often to change the oil, it's best to follow the manufacturer's recommendation, but I would suggest changing it every 5,000 miles for an older car like the Audi 80.

I have been using mineral oil for my Audi 80 and it has been running perfectly fine. As for how often to change it, I would say every 3,000 miles just to be on the safe side. But ultimately, it's important to check the oil level and condition regularly and change it as needed.

I've had my Audi 80 for over 10 years and have always used a semi-synthetic oil with a 10W-30 viscosity rating. It's important to check the owner's manual for the recommended oil and change it according to the maintenance schedule. And don't forget to also replace the oil filter with each oil change.