New boat questions...

[Oscarlyy]

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 the expansion tanks are getting a bit low so I would like to fill them. But do I have to use red coolant still or can it be something else? If it has to be red coolant do you have any recommendations for good coolant? That's all the questions, for now... Thank-you CSR!

 

[paulswagelock]

Oil - you will get lots of opinions here. I suggest any major brand 15w40 oil (Delvac, Delo, Rotella, premium blue). I believe the red antifreeze is actually orange, dexcool version, that is what is in mine although my engines are newer. If so, you can't mix, and if you change it you would need to be certain 100% is removed because the combination can clog cooling passages. If dexcool, find the pre diluted store brand that is least expensive near you.