Genuine Mercruiser diesel oils and lubricants, available by mail order. Mercruiser / Quicksilver branded diesel oils are the genuine OEM product, formulated to withstand the harsh environment in which Mercruiser diesel engines operate. Mercruiser diesel oil filters and the oil should be changed at the end of each season, as should the sterndrive oil. The leg oil should be changed by using Premium Plus gear lube.
Genuine Mercruiser Quicksilver branded oils are the genuine OEM fitment and should always be used to ensure the safe and correct use of your diesel. Don't forget to use a diesel bug treatment every time you fill up to prevent bug within the fuel system. Look at Express Lube Fuel Doctor for further information.