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Old 01-28-2009, 03:46 AM   #25
FF
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Oil-Bypass-System

Most of the research I have seen gives the longest engine service life with single grade oil.

The multi-grade does allow cold starts a bit easier and perhaps 1% or so better mileage from the thin oil being easier to scrape from the cylinder.

With a warm weather boat I would always prefer single grade.

Synthetic has far poorer ability to protect an out of service engine from internal rust , perhaps a poor choice for trawlers with extended non use times.

FF


-- Edited by FF at 05:48, 2009-01-28
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