Originally Posted by BrianBrave
The very best preventive maintenance on a highly modified engine (or any engine) is to spend around $40 for an oil analysis. A regular oil analysis program can inform you of abnormal internal wear, leaky injector or coolant leaks, etc...etc..
This is best done by maintaining a regular oil change interval and using the same lab - as they will keep your records and track the percentage increase in oil contaminants and viscosity breakdown from oil change to oil change. This will warn you of pontential falures and allow you to repair the problem before a catastrophic failure. If they know the engine manufacturer, they can even guide you as to what components are wearing down...
Changing your oil after every race will only mask the problems - it may delay the time to ultimate failure if the oil contaminants are contributing to the cause of the wear. But if you have excessive contaminants in your oil - it's a sign of some other problem that fresh oil and filter won't fix...only mask...
If they are not going to change their oil regularly then there is no chance their having the oil analyzed. It's doomed from when they buy the car.