Where does your oil temp sit at on your 2.8 during freeway speeds?
#16
on my 96 2.8 when my oil temp started climbing
it was the coolant. turned into a clogged radiator. change and do a thorough flush of the coolant system, esp open the plug on the block. When I opened that one the crud just poured out. Hope your rad hasn't clogged yet, do the change asap. the coolant is not life time as Audi claims.
#18
mine is quite high compared to others, at least 225 usually 250 sometimes even 275 . . .
and it has always been like that since i bought it about 50K ago. It goes to 250F at 70-80 mph cruising, and 275F when I'm doing 90 plus or towing a trailer 70-80mph.