I don't know how this idea took hold, really, but it's bogus. Modern cars with onboard diagnostics are easier to fix than vintage stuff imho. Reading the code(s) with a $50 OBD2 reader and swapping a part or two is easier than rebuilding a carburetor or setting ignition timing with a timing light.Actually, some of the stuff in this makes some sense - like knowing how to fix your car. You need a computer, not an adjustable wrench and hammer, these days. . Of course, that's for FIXING the car.