I'd like to ask them if they'd ever do it again
Look at the economics of this grand idiotismo. So he needs to pay the mechanic hell knows how much and the mechanic could be making $$$ for him elsewhere in the meanwhile, he messes up the red truck that he could otherwise sell to offset the costs of actually purchasing a diesel truck. He gives MS and a number of other idiots tools to blackmail him. He should have also accounted for the eventuality of getting caught.
It makes 0, absolutely 0 sense.
I mean, how long does it take for somebody to figure out that sometimes it's better to just pay than " diy". Unless one enjoys the process.