like what the title says what trans fluid does the s80 t6 use?it has 170000 miles on it?

 

That is actually a GM 4T65E transmission and uses Dexron III fluid. The best bang for the buck for that fluid IMO is Valvoline MaxLife. It is a full synthetic and can be had at Walmart for $4.97 a quart or $16.97 in a 4 quart container. I have used it for years with great results.

 

where do i pour it in??