1 miles before power is effected, as the first few hundred miles break in the car, making it faster. then after about 800-1000 miles, it seems to start to wear down.
I was doing the Dream Car Championship race at Midfield2 pro league with my F094/s and the oil light came on, on lap 12. When the light comes on the performance of your car is supposed to fall 20hp according to the GT3 manuel but on lap 14 i did a 54.892second lap when my previous best was above 55.