If you have ever wondered what Marvel Mystery Oil is, you're in good company. We've done the research and compiled everything we know about it right here.

Engine oil additives make all sorts of promises about helping your vehicle's motor last longer and increasing your gas mileage. Here's what you need to know.

Zinc additives are fairly common in oil, especially when treating a classic or high milage engine, but what does the additive actually do for your engine?