Doing This With WD-40 Will Save You Thousands in Car Repairs, DIY life hacks and car repair with Scotty Kilmer. Car life hacks. How to use WD-40 to fix common problems in your car. Paint scratches, door locks, electrical issues, stuck tires, WD40 can fix them. WD-40 life hacks and car repair with WD40. DIY car repair with Scotty Kilmer, an auto mechanic for the last 50 years.