The SAE 40 viscosity ranking is intended to function very well under quite high temperatures. Large motor-load cases may also be thoroughly lubricated with the SAE forty body weight oil. You will require a flat screwdriver, oil pump, and drain pan to fill MerCruiser out drive oil into your boat. https://jaredeimlq.uzblog.net/how-types-of-oil-goes-in-a-mercruiser-outdrive-can-save-you-time-stress-and-money-41539567