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Which 15W40 for an Onan generator? #5356745 02/21/20 07:39 PM
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atikovi Online Content OP
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Not sure which forum to post this, but I need to change the oil in an air cooled 2 cylinder gas engine Onan generator. The manual calls for 15W40 but all I see for that weight mentions diesel. Is that ok for this engine?

Re: Which 15W40 for an Onan generator? [Re: atikovi] #5356748 02/21/20 07:41 PM
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tundraotto Online Content
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Yes - just get a 15W-40 that is also API SN rated for gas engines if it worries you; delvac, delo etc....

Re: Which 15W40 for an Onan generator? [Re: atikovi] #5356749 02/21/20 07:45 PM
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Re: Which 15W40 for an Onan generator? [Re: atikovi] #5356750 02/21/20 07:46 PM
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Yes for sure. Note the SN on the API roundel on the back label.

Re: Which 15W40 for an Onan generator? [Re: atikovi] #5356830 02/21/20 09:40 PM
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Rotella

Re: Which 15W40 for an Onan generator? [Re: Vern_in_IL] #5356847 02/21/20 10:10 PM
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While I am sure Shell Rotella would work just fine - it is not certified or approved for gasoline engine use.

Re: Which 15W40 for an Onan generator? [Re: tundraotto] #5356911 02/21/20 11:13 PM
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pkunk Offline
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Originally Posted by tundraotto
While I am sure Shell Rotella would work just fine - it is not certified or approved for gasoline engine use.

Been working fine in mine for over 20 years


8200 ft elevation in the Sangre de Cristos
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Re: Which 15W40 for an Onan generator? [Re: atikovi] #5357142 02/22/20 09:35 AM
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ARCOgraphite Offline
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Marine 4 stroke oils are MUCH better than Diesel and Fleet . If for Spring through Summer use.

Quicksiler Marine 4 Stroke


2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#8 60864mi-Subaru Idemitsu 0W20 + SOA Filter
Re: Which 15W40 for an Onan generator? [Re: ARCOgraphite] #5357149 02/22/20 09:42 AM
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Originally Posted by ARCOgraphite

\

Marine 4 stroke oils are MUCH better than Diesel and Fleet . If for Spring through Summer use.

Quicksiler Marine 4 Stroke

At the commercial marine operations I have been to I never have see any using Mercury oil, just the mainstream HDEOs.


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Re: Which 15W40 for an Onan generator? [Re: ARCOgraphite] #5357153 02/22/20 09:47 AM
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The local O’R’s parts house carries Mystik … pretty good numbers. Going to try some next change.

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Re: Which 15W40 for an Onan generator? [Re: atikovi] #5358054 02/23/20 01:02 PM
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Super Tech 15w40 will fit the bill fine.
I have ran many hours using delavc/ST 15w40.
I have use of/cf2 in sae 30/40, pceo sae30/40/50, 20w50 also with good results for what it matters.
Any oil will treat you well as long as you do regular oil changes and keep it full.


-Harvey

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