Just went to Autobahn Autoclub in Joliet, IL. They have 10 335i's. They're all autos. All came initially without the air/oil cooler installed. All 10 had overheating problems and limp mode problems regularly after 30 mins of hot lapping (balls to the wall). Now they have the air/oil coolers installed and they have overheating problems after 60 mins of hot lapping. My car didn't overheat after 40 mins of track time, but only 10 mins was at my limit of ability (8/10ths of car's ability probably
) I rode a couple laps with Tom Bagley (look him up... Indy 500 '78-'80... top finish was 9th) and he drove the car at 10/10ths in 86F heat and had the heater and defrost maxed to keep temps from shutting the car down. The course is the 1.4 mile north course and he was getting the car up to 115mph on the straights and just beating the heck out of it (probably 30 laps total). It probably would've gone into limp mode in a couple more laps, but it held up ok. What great fun that was....