True – even after 40 years of car repairs/restorations I find I know less the more I learn..MMAYBE.....but perhaps a close third place candidate is an understanding of the thermodynamic principles related to automotive cooling systems and the rate of temperature change, velocity, and BTU/Hr exchanged.......but which spark plugs are best and which oil type is best and high volume - vs - high pressure oil pumps are best are alternate topics.....subject to personal preferences and the "my buddies friend's" rule.
BOB RENTON