SEMPERFI8387
Moderator
Haven't seen a post from him for about a week. Hope everything's ok ?????
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Kind of what I was thinking, the only thing the Yamaha guy was saying that since I only have 15 hours on the boat he was thinking I should do the 10W again , dunno. I look at my Escalade and it has always had full syn in it, even though GM now says you CAN run semi syn in it. I figure it was good then, might as well keep doing it.Go w/what Yamaha recommends 5W 30 Full synthetic although you can use 10W 30...................In my Mercruiser I/O I use their recommended 20W-40 full synthetic although I could use just straight 30 weight oil. I've had a couple mechanics tell me that...............