Preparation and Instructions: Add 30mL of Sea Foam Motor Treatment per oil liter for all 4-cycle gasoline and diesel engines. When ready, remove OIL FILLER CAP and pour the recommended amount of Sea Foam Motor Treatment directly into the engine crankcase.  Do not exceed one treatment per oil change interval. Though Sea Foam can be added at any time between oil change intervals, we recommend adding Sea Foam to oil crankcases 150 to 450 drive kilometers before changing oil and filter. When checking dipstick, always change oil that goes from clear to dark. Benefits: Sea Foam will safely liquefy petroleum residues that restrict flow and lubrication Cleans oil control rings, VVT solenoids and actuators Dissolves and cleans deposits throughout the crankcase including diesel soot residues Cleans and quiets noisy lifters, timing chain tensioners, and reduces diesel injector stiction Additional: > Sea Foam only contains petroleum-based ingredients and cannot harm your engine > Sea Foam will not change the viscosity of motor oil > Sea Foam is compatible with all types of conventional and synthetic motor oil > Sea Foam will not affect seals, gaskets, or O-rings