About Sea Foam
Sea Foam traces back to the 1930s, when Fred Fandrei, a petroleum industry salesman, developed a petroleum-based formula to fix the fuel-related problems fouling his outboard motor. The mixture caught on with his fishing buddies, and he started selling it to local fishermen in beer bottles and quart jars, naming it "Sea Foam" after a friend in Florida. Sea Foam Sales Company was formally established in 1942, and the brand still carries the tagline "Trusted by Mechanics since 1942." Today the company is headquartered in Chaska, Minnesota, and distributes nationwide through auto parts retailers including NAPA and O'Reilly Auto Parts.
The product line has grown well beyond the original marine-market formula into Sea Foam Motor Treatment, Sea Foam Spray, Trans Tune, Deep Creep penetrating oil, IC5 Fuel Injector Cleaner, Marine PRO, and a High Mileage line, all built on the same petroleum-based cleaning and lubricating chemistry rather than harsh detergents. Sea Foam Motor Treatment -- the product featured on RevRated -- is one of the best-selling automotive additives in North America, and it's earned a reputation among working mechanics for reviving neglected engines and carburetors that have been sitting with degraded fuel, which is exactly the use case our own testing and review data back up.
Brand website: seafoamworks.com
What Sea Foam makes
Sea Foam's range runs wider than the products we review. The lines we know best from our own testing are marked with a star:
Sea Foam Motor Treatment
the original 3-in-1 fuel, oil, and intake treatment -- featured on RevRated — featured on RevRated
Trans Tune
additive for automatic transmissions, hydraulics, and power steering systems to smooth shifting caused by gum and varnish buildup
Deep Creep
penetrating oil and lubricant for rusted or stuck parts, throttle body cleaning, and engine storage fogging
IC5 Fuel Injector Cleaner
concentrated injector-specific cleaning formula
Marine PRO
fuel treatment formulated for marine engines and ethanol-blended boat fuel
Sea Foam High Mileage
additive line aimed at higher-mileage engines
Why we recognized Sea Foam
The RevRated Top Brand recognition isn't paid for and can't be applied for. We award it to the brands whose products consistently stand out in our hands-on category reviews. Sea Foam earned it on the strength of the products below, evaluated the same way every product on this site is: bought, run on real vehicles, and judged on merit.
Sea Foam products we rated highly
Sea Foam Motor Treatment (4-Pack, 16 oz each)
One of our top picks for versatility in garage testing -- three application modes (fuel tank, crankcase oil, and intake manifold via vacuum line) let it clean the fuel system, lubricate the oil system, and address intake deposits from a single product. It carries the largest review corpus in our injector-cleaner roundup at 29,933 Amazon reviews and a 4.8-star rating, spanning carbureted small engines, port-injected gasoline vehicles, and diesel equipment, and the four-bottle pack works out to a full year of quarterly treatments.
Read the 8 Best Fuel Injector Cleaners of 2026 guide →
Sea Foam Motor Treatment, 16 oz. (3-Pack)
A genuine 3-in-1 in our testing -- it works as a fuel stabilizer, a carburetor and injector cleaner, and a crankcase oil treatment, which is the only product in our stabilizer roundup that legitimately spans all three jobs. It's especially effective on carbureted engines with gum and varnish buildup in the float bowl and idle circuits, works in both gasoline and diesel and is 2-stroke safe, and holds a 4.8-star rating across 29,899 Amazon reviews.
Read the 7 Best Fuel Stabilizers of 2026 guide →What earned Sea Foam the recognition
- Sea Foam Motor Treatment earned a place among our top picks in two separate RevRated categories -- fuel injector cleaners and fuel stabilizers -- reflecting genuine cross-category versatility rather than a single isolated result.
- It carries the largest review corpus of any product in our fuel injector cleaner roundup at 29,933 Amazon reviews, and 29,899 more in our stabilizer roundup, both at a 4.8-star average.
- Three application modes -- fuel tank, crankcase oil, and intake manifold via vacuum line -- give it a versatility no single-mode competitor in either roundup matches.
- Works across gasoline, diesel, and 2-stroke engines, making it the practical single-bottle choice for owners with mixed equipment fleets in the same garage.
- The brand has operated on the same petroleum-based, detergent-free cleaning chemistry since Fred Fandrei's original 1930s formula, and Sea Foam Sales Company has carried the tagline "Trusted by Mechanics since 1942" for over eight decades.