The new oil is National Marine Manufacturers Association FC-W certified, and the 25W-40 blend can be used in any marine engine, including Verado outboards, except pre-2007 “Gen I” Verado motors. These particular engines should still be filled with Mercury 25W-50 synthetic Verado oil. I was told that this is because Mercury simply doesn’t have a Gen I Verado available to use for oil testing, and thus can’t yet certify the new oil for those motors. These three oils replace six different bottles that used to line a Mercury dealer’s shelves. more