the pointy end is the bow
Join Date: Aug 2006
Location: La Conner, Washington
Thanked 26 Times in 26 Posts
Rep Power: 10
Diesel motors require an oil that can withstand the soot and other particulates that end up in the motor oil. As far as whether to use multi-grade or a straight grade motor oil, I was of the opinion that straight weight motor oil was the best. I have since changed my opinion on that. Back in the 80's, I rebuilt motors in highway trucks. Cummins and Detroits were our bread and butter. Cummins was specific about using a multigrade oil in their motors. We had a customer come in after one of our rebuilds complaining about his oil consumption. He was using 30 wt oil instead of 10-40. We switched him over to the Cummins recommended 10-40 (or whatever it was) and the owners oil consumption went back down to normal. I was impressed. There is a difference and there is a reason why engine manufactures recommend certain oils.
Oh, and Delo-400 is one of the quality oils for diesel motors.
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.