What is the best oil viscosity for an Audi 80 engine?

I am planning to change the oil in my Audi 80 and I want to know the ideal viscosity for its engine. Can someone recommend the best oil viscosity for this specific model?

For an Audi 80, the most suitable oil viscosity would be 10W-40 as it provides good stability and protection for both low and high temperatures.

I have been using 5W-30 in my Audi 80 for years and have never faced any issues. It is a great choice for both summer and winter seasons.

I recommend going for a fully synthetic oil with a viscosity grade of 5W-40 for optimal performance and protection of your Audi 80's engine.