I let my car to be broken during the night on B-Spec Endurance race like Indy 500 or Nurburgring 4h, after this i do an oil change, chassis refit and engine overhaul. I don't remember exactly because i do this like a robot now, but it seems that it's possible to do both. What i don't know is if you change oil first and engine overhaul after you have a gain of power , or if the game deduct that engine overhaul only include oil change of course and sum it automatically.????
CyKosis1973 , i don't know if it's better to wait 1500 miles, to make a rebuild. If the game offer this possibility earlier ,it's because it must be enough with less than this and waiting more time or more miles do not increase the power after the rebuild....
If somebody tested all this already and have some reliables results to share , i'll be glade to know about. Thanks.
Have a good day everybody.