[david]

Well, personnally, I was first suprised too (and warried), but, by having a few laps in Csl's (and M3) with hard driving with other cars close and on the track, all of them had the water and oil temperature gone up, seen the water and the oil jauge both at 2/3 in many M3 serie E46, I got to the red limit due that I was chassing benM3 + other car by sticking to there ass in straight line, the cooler was catching directly the exhaust and engine heat and does take any fresh air at all, that's why I got too the red limit,when I saw that, I dropped the throddle, moved out on the right side, shift to 6 and drove around 60/65miles and water temp came down right away back to the 2/3 and slittly lower than the 2/3 gently.

warried, I gave a rang to 2 bmw specialist around France (as Marchal sport and Delage), they told me that it was normal to see the water temp go up on track and intense driven when you used gears 2/3/4 till 8000 often and no warries to have until you stay below the red zone and below of maximum 2/3 of the oil temp, they just told me that if that happen, to assure the best, I needed to change oil and cooling liquide often

BenM3 used Motul Mo-coo before, he saw clearly the difference since, I've not tried it yet on track.