Join Date: Aug 2003
Location: Long Island, NY
Thanked 52 Times in 47 Posts
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I don't know that much about your OB, or OB's in general. I do know a fair amount about automotive gasoline powered engines and marine auxiliary diesel engines.
I use synthetic oil in 2 of my 4 cars. One is a small displacement turbocharged engine in a race car. The other is a high reving high output engine. The other cars are not special and I use regular oil in them
I don't believe that a marine engine for sailboat would benefit from synthetic oil. Compared to a car, the oil in a sailboat engine leads a pretty easy life. No real cold starts (below freezing), not much idling. No hard starts and stops. Low RPM. The typical marine use is to start the engine (and usually the coldest temperature a marine engine will see is the 50's), let it warm for a bit, set the throttle to cruise speed, and leave it there. After some time, shut the engine down. From a lubrication perspective, that's about as easy as it gets.
About the only difficult thing I can think of regarding marine use would be relatively long engine off periods. This can allow the oil to drain off the cylinders and make cold starts more difficult. A synthetic would help here, but this is a real minor point.
A few more points: Synthetic oils last much longer than standard oil. However, in a diesel engine you typically change the oil because the oil is contaminated with soot and other dirt. Synthetic oil will still have to be changed often as it gets dirty. And (IMHO) you should never go more than a year between oil changes.
On my boat, with the small diesel (Universal M 25) that runs for maybe 50 hours a year, regular oil, changed in the fall before haul out, is good enough.
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY
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