Re: Oil filter?
I buy Merc filters, becuase I'm already there buying everything else at the local merc shop. I get my engine oil, lower unit lube, oil filter and fuel filter one stop.
Of couse mercury is going to only recommend their brand. There are several reasons. One is that they specificed the standards, and know they are fit for the purpose. They don't know that about other brands. They also make money on the stuff, as do their dealers.
No different than Honda, GM, Ford, Toyota, etc... They all recommend their own stuff.
Laws protect us from them voiding warranties if equavilant parts are used.