A dent puller can't put a crease in metal unless the panel was already stretched or the glue let go at an angle. The puller itself doesn't crease anything, it just grabs a stud or a tab and pulls. If it slipped, that usually means too much force or the tip wasn't seated flat, which can lift the metal instead of pulling it out smooth. A real crease means the steel bent past its yield point, so now you're looking at hammer and dolly work or a stud welder and shrinking, not just another pull.

A guy painting cars who thinks runs flow out is wild.

Peanut oil has a higher smoke point so it breaks down slower, that's the real reason it lasts. My setup is a dedicated Fry Daddy that only ever sees peanut oil and I get maybe 8 to 10 batches before it starts smelling off. The trick is filtering it through a coffee filter or fine strainer after each cool down and keeping it in a dark spot. Heat and light are what kill oil way faster than the number of fries you throw at it. Also don't let crumbs sit in there, those little burnt bits are what make everything taste like old fish lol.