John Paul, AAA Northeast's Car Doctor, answers a question from a reader curious about using Marvel Mystery Oil. AP Photo/David Zalubowski Q. I perform routine maintenance on my family’s cars and just ...

Over time and miles, your car might start to slow down. It might not accelerate as quickly as it once did; the engine ...

Fuel additives can promise better car performance, but there’s not enough data to verify the claim. Regardless, certain vehicles likely wouldn't benefit. Many, or all, of the products featured on this ...

Along with improving reliability and performance by enhancing control of the air-fuel mixture, injectors also need less ...

Fuel injectors can get gummed up with dirt and fuel residue over time. Photo credit: David Traver Adolphus / Autoguide.com. Over time and miles, your car might start to slow down. It might not ...

Winter is the time of year that really puts diesel trucks and tractors to the test. Sure, a boosted engine loves cold air, but you know what doesn’t? The fuel that makes these workhorses run. That’s ...

During the use of a car, engine carbon buildup can be a source of concern for many car owners. Many owners notice a gradual decline in vehicle performance but are unsure whether it is related to ...

FARGO, N.D. - Yes, North Dakota State University has indeed tested the fuel additive CA-40. The tests - replicated six times in a laboratory - show no significant improvement, either in horsepower or ...