fatcatone549
Member
Hi Guys what weight oil do you use in your 350
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Hi Guys what weight oil do you use in your 350
Not for cost reasons, I am wondering whether diesel rotella 40w is better than Mercruiser oil though.
"Better" is subjective. Merc 25w40 Catalyst compatible oil is not a very stout oil when it comes to additives. In order to be catalyst compatible the high pressure boundary layer additives need scaled back to avoid potential catalyst poisoning. As a result, there are oils for older boats without catalysts that contain more additives and could perform better. Most diesel oils fall into this category.