STP Multi-Purpose Motor Treatment is like a can of liquid tune-up! Use it for year-round oil and fuel system care, for virtually every type of gas and diesel engine. Just pour the bottle directly into the gas tank. In the fuel system, STP Multi-Purpose Motor Treatment helps protect against viscosity buildup and sludge that can cause corrosion. It prevents fuel line freeze by removing water... And helps clean injectors and intake valves while providing upper cylinder lubrication. Use STP Multi-Purpose Motor Treatment in the crankcase to help dissolve sludge and keep your engine running smooth Put some in the fuel when storing an engine for the winter to stabilize the fuel and protect against corrosion. STP Multi-Purpose Motor Treatment is available at... Canadian Tire.