I've searched the net quite a bit, and through this site, and just looking for specific *opinions* about what type/weight oil to run in my Merc.<br /><br />It's a 2000 Celebrity 220 Bowrider (22') With a Merc 350 I/O, 300hp EFI; 220 hours. I just bought it a week ago. <br /><br />Merc...