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Old 09-02-2015, 08:16 PM   #1
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Default Westerbeke Generator oil

I have a Westerbeke 4.5 KW gasoline generator in my Maxum 2700 SCR. It is docked in Kentucky. I am changing the motor oil. The manual says I can use either 10w-30 or a straight 30W. Any recommendations? Multi or straight? Brand of oil? Mercruiser oil?
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Old 09-02-2015, 11:41 PM   #2
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Besides the weight what other specifications are in the manual? Synthetic, deterigant rating,...

I would follow all the requirements.
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Old 09-03-2015, 12:47 AM   #3
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I have 1800 hours on a 1998 7.2 and have used Mobile 1 sine 200 hours and still runs like new.
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Old 09-03-2015, 02:35 AM   #4
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It didn't say anything about using synthetic. Calls for API "SJ"
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Old 09-03-2015, 06:09 PM   #5
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"SJ" is an old API classification that was last used in 2001. The current "SM" came out in 2010 and has all the qualities of the previous classification plus recent improvements.

SJ is the next one to be obsolete as did SH, SG and all the way back to the original SA for the cars from the early 1900's.
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Old 09-03-2015, 10:02 PM   #6
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Thanks, I will look for the "SM" rating. Synthetic or detergent?
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