What is the best engine oil for a 1990 Audi 80?

I recently purchased a 1990 Audi 80 and want to ensure I am using the best engine oil for its age and model. Can anyone recommend a specific brand or type of oil that is known to work well with this car? Thank you in advance.

I recommend using Valvoline Advanced Full Synthetic 5W-30 motor oil for your 1990 Audi 80. It provides excellent protection for older engines and is specifically formulated for high mileage vehicles. - Mark Johnson

I have had great success with Royal Purple HMX High Mileage Synthetic Motor Oil in my 1990 Audi 80. It helps restore engine performance and reduces oil consumption. - Emily Brown