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.

Sea Foam won't undo major engine damage caused by owner neglect or mechanical defects, but it certainly seems to make my older, tired engines run a bit quieter and smoother.

The Sea Foam did what it promised: it dissolved the varnish, and sludge inside of my engine, and my transmission. Three years, and 9,000 miles later, I decided that maybe my engine could use another ...

Another viewer simply refused to believe the product made any difference. “25 years small engine tech with MST, Honda, Kawasaki, Stihl certifications. truth here…no. Seafoam is BS.” ...

In days of yore, these products were largely limited to liquid additives like Marvel Mystery Oil, SeaFoam engine treatment, and Liqui Moly Engine Flush.

Rotary has unveiled new fuel stabilizers and treatment additives for small engines. A complete line of products is featured in Rotary’s 2023 master parts catalog including STA-BIL, Ethanol ...

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.