The only other thing I would add is this. If you show up in any car, and you break in the middle of a run. Stop as fast as it is safe to, and pull toward the closest safety wall (right lane right side). Why do I mention this??
If you throw a rod, or break of the smallest of oil lines, you will oil the track. If you get mad at your car and rev the engine and keep driving, you will make the "oil down" even worse. I run a class and sanctioning body that requires diapers, but most don't. This is a "professional" courtesy to the other drivers, and the safety team. One puddle is easier to remove then a streak that goes all the way back to the pits.
(Pet peeve of mine.)