MANNOL Motor Doctor is an additive designed to increase oil pressure and to decrease oil consumption in worn out engines. It prevents oil from getting into the combustion chamber and opposes the formation of soot and engine smoke. It decreases wear of new engines, prolongs their working life and forms a reliable lubricant film on rubbing engine separate parts. This lubricant film ensures flawless engine functionality under hard conditions and guarantees problem-free cold starts. This product is mixable with all synthetic and mineral oils. Add the Motor Doctor to the engine oil during oil change. It can be mixed with all mineral and synthetic oils. A can is sufficient for up to 5L oil fill volume.