ok folks. I have discovered the maximum amount of power that can be lost. This number is about 16% of the maximum HP your car can show. This maximum amount is reached at approx. 62500miles/100,000km. I have also ran the car (FGT) another 5500miles to confirm this fact. So my FGT started with a maximum of 936HP, and finished up with 785, for a loss of very close to 16.1%. This also takes into account no oil changes or engine rebuilds. If you have seen different numbers please let me know.