Join Date: Feb 2009
Location: NY Metro
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Agree with the last poster about pro installation.
All things being equal an idea might be to get a used oil sample from each and have it analyzed. Buy the one with the cleanest report. Yjis is likely not possible but its an idea.
I have a Westerbeke and am very satisfied with it. I have never owned a Yanmar but I believe the parts are cheaper for the Yanmars.