Originally Posted by manyboats
Very good and informative link.
So I use 30W RPM Delo oil and change often.
I couldn't agree more !
I have become a strong believer in using a high quality (Delo, Rotella, ...)single wt dino oil.
My reasoning is exactly in line w/ your comments re: single vs multi Vis...
The points made in the article about additive packages used in the newer API rating multi Vis oils (especially Syn) that are pointed at Diesel emissions reg's and pollution control systems on autos & trucks... that don't apply to us and can actually cause problems.
I used to believe that the newer ratings were always backward integrated and superior - the article changed my opinions and it's the only one I've found that deals w/ marine applications.