The plugs should be re-gapped every 50 flights or you start to lose power, and the valves should be adjusted on a similar schedule or they get noisy.
Also top off all the fluids before every flight.
I said he was smart not a genius. And his personal life has nothing to do with things he has accomplished in his professional life. He's definitely accomplished more than most including you and I. Like the other poster said, he's the richest man...
Elon is eccentric and a bit manic at times but many of the smartest, or talented people in the world today and throughout history are. I'd buy his drone if he ever made one. Wish I had bought his "NOT A FLAMETHROWER" when it came out. It was only...