ProMax performance additive is quick and easy to use, just pour it right into the engine crankcase. Recommended mixture is 1 part ProMax to 10 parts motor oil. (1:10) You can do this as part of or in between oil changes. Then add the same amount each time you change the oil. The vehicle manufacturer’s recommended service schedule should always be followed. Use in gearboxes, V-drives and manual transmissions. ProMax is compatible with synthetic and conventional oils. Not recomended for new engine break-in routines. Refer to manufacturer recomendations for break-in periods. Prevents 'cold start' damage.