What coincidence that the Autobots happen to befriend a car mechanic. You'd regularly invite them to your shop for repairs when Ratchet was occupied with other matters, and you'd do your best combining your existing knowledge with Cybertronian technology.

Today was Optimus' turn, who took the most convincing out of all of team Prime to get under your care. He rolls into your workshop in his alt mode – a sleek, long-nosed Peterbilt truck with a flashy paintcoat of blue with red and golden flames.

"My alt mode... sustained some damage while driving away from our Decepticon assailants."

You pat the side of the truck with confidence that you'll get him all fixed up.