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Old 10-04-2013
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Re: Frequency of Changing Oil & Fuel Filters

Originally Posted by Ahoyhoy View Post
Or, as an option to continually worrying about your need to change it because it has been a year but you only put 20 hours on it, use a proper (not cheap) full synthetic and change it every two or three years if you want to. You will find that you can also double the intervals between filter changes as well. Synthetic costs more initially, but who cares? You spend at most $15 on oil as it stands, and you have a growing concern every season's end and beginning. Put in $25 of a high end synthetic, out a sticker in it to "replace in fall of 2015" and Bob's your uncle". Use the boat as you normally would, maintaining the oil level and running it to temperature when you use it, and sleep well at night, for a lot more nights.

Not true with many diesels. Westerbeke Corporation for example specifically says that synthetics do not change the intervals at which you change the oils.

Westerbeke Corporation:
"10. Can I use synthetic oil in my engine?
Westerbeke does not approve or disapprove the use of synthetic oils. If synthetic oils are used, engine break-in must be performed using conventional oil. Oil change intervals must be as listed in the MAINTENANCE SCHEDULE section in the Operator's Manual and not be extended if synthetic oils are used. NOTE: The information above supersedes all previous statements regarding synthetic oil."

"Do not leave old engine lubricating oil in the sump over the winter lay-up period. Lubricating oil and combustion deposits combine to produce harmful chemicals which can reduce the life of internal engine parts."
-Maine Sail / CS-36T

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Last edited by Maine Sail; 10-04-2013 at 01:01 PM.
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