synthetic oil

I have always used the Mercury oil in my boat. But since it is well out of warranty and getting older, I have been thinking of going to full synthetic. Since Merc no longer makes one I have to go in a different direction. I use Mobile 1 in my jet ski with good success so far. I can't see a...

Hey there, I just bought myself another Sea Ray 5 months ago, a 345 sedan Bridge with twin 7.4 454 engines that were rebuilt 40 hours ago. Since it's new to me I have some questions... What oil do you use for the engines? And can it be synthetic? The engines have red coolant in them now and...