For Marine, Auto & RV Use. This 1-gallon (128 oz.). Marine & RV Approved: Trusted by boaters and RV owners to protect engines during long periods of inactivity. Why Choose Sea Foam SF-128?. Perfect for preventative maintenance or reviving older engines, Sea Foam is made in the USA and contains no harsh solvents or abrasive chemicals—just a petroleum-based formula that’s safe and effective.
