Putting regular oil instead of synthetic in your engine isn’t just a swap—it can actually change how your car runs. This article breaks down the real differences between regular and synthetic oil, and what could actually go wrong if you use the wrong one. Expect clear tips, facts, and what to watch for with your engine if you made the switch by mistake. Skip the myths and get the real deal you can use right now. Perfect for any driver who wants to keep their car running smooth and avoid headaches.