Originally Posted by Mike

like was posted, it goes into limp mode at 280, so you are fine up to that point. Its not ideal, but it won't do any harm. When I had my superchared corvette, both my local performance shop and the head mechanic at Spring Mountain race school in Las Vegas said 285 was as hot as I wanted to see the oil in the LS2, and I think its a function of oil break down and not the particular engine.

before my oil cooler, I saw 260 in stop and go traffic here in atlanta at around 100 outside air temp.