What type of oil goes in a 1986 Audi 5000S?

I had an 86 5000S (Gasoline model). It used SAE30 as I recall.

AnswerI would personally use 10w40 or 15w40.

I concur with 15W40, my mechanic tells me to put 15w40 because it is thicker and older engines which are worn make it easier for oil to pass through and thus your oil pressure is low. 15W40 is Diesel engine oil but will not harm your gasoline engine, i have been putting it in my 1989 100CS quattro for years now and it runns better. For colder Canadian winters (-40C) I use 10W30 so it will turn over better when cold.