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Which 15W40 for an Onan generator? #5356745 02/21/20 07:39 PM
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atikovi Offline 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 Offline
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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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atikovi Offline OP
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Re: Which 15W40 for an Onan generator? [Re: atikovi] #5356750 02/21/20 07:46 PM
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tundraotto Offline
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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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Vern_in_IL Offline
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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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tundraotto Offline
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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
2008 Mini Cooper Clubman (toad)
2000 Mercedes ML320
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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#9 70254mi-Rotella
Gas Truck 5W20 + Fram Ultra 7317 Filter
Re: Which 15W40 for an Onan generator? [Re: ARCOgraphite] #5357149 02/22/20 09:42 AM
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CT8 Offline
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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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4WD Offline
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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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bithebay87 Offline
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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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