GAP Professional Products® Engine Keeper is a powerful engine cleaning additive specially formulated to clean valves, piston rings, and oil lines while removing sludge and varnish between oil changes. It quiets noisy hydraulic lifters, prevents future deposit formation, and is safe for use in gasoline and diesel engines—including GDI, MPFI, hybrid, and turbocharged systems. Compatible with all mineral-based engine oils, Engine Keeper helps restore performance and extend engine life with every use. Treats up to 6 litres.
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