This year the wheels will be packed with the appropriate lubricant,
rather than a spit of WD-40.

I was with you up to here. Anything other than graphite is cheating. Your
choice, but just what is it that you want your son to learn here?

Our group stopped running the derby. Every car was built by the father and
all the winners were cheating. We just decided it wasn't a proper scouting
event.