Quote:
Originally Posted by ak-guy
Just a little more info. My engine is 1981 or so, Yanmar 3HM. Designed as a raw water cooled engine though originally installed with keel cooling. It runs at 140-150 F. I hadn't thought about this before but at that temp the oil is also at that temp so the multi grade oil is not being used to its full range. Whatever that means.
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With these low temperatures the oil probably never gets hot enough to boil-off the condensation out of the oil. Without frequent changes your oil may be prone to sludge build-up.