My new to me boat is a 2017 chapperal with the mercruiser 4.5l 250hp. This motor had the option to come with catalytic converter or without. Mine HAS the cat .....Now from my research the oil it takes is the mercury 25W-40. And my research also said that marine oil has additives that are no good for cats, so I'm now I'm not sure what oil to use. I wanted to go with M1 extended performance/ high mileage Extended performance like I use in all my equipment but now I see they don't make a 40 weight version. So I was going to go with just M1 10W-40....
Previous owner always had the marina do all the maintenance with OEM recommended oils,lubes,seals etc. 300 hours on the boat. Oil changes occured every year so 6 oil changes have already been done
Any insight would be great.
Previous owner always had the marina do all the maintenance with OEM recommended oils,lubes,seals etc. 300 hours on the boat. Oil changes occured every year so 6 oil changes have already been done
Any insight would be great.