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Old 05-14-2015, 04:11 AM   #1
Join Date: Mar 2015
Posts: 83
Onan 5500 gaz

Which is better regular gaz or high octane Cummins manual no instruction since some small engine runs better with low octane what do you run yours with?

2016 Spartan 1234X Trail-Air Pin Box...thermo windows...12 cu.ft frig....3 seasons patio door
2011 Ford F-250 Super Duty Power Stroke King Ranch 4X4 diesel
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Old 05-14-2015, 07:39 AM   #2
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Location: Valencia, Ca
Posts: 190
Imo all the "toys" should only be ran on premium fuel. And I always put Stabil in as well because I never know when it's going to get used again. Same applies to all of the garage gear. Jerry

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Old 05-14-2015, 07:51 AM   #3
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Location: Winter Park, FL
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I always use the standard 87 fuel in everything - no premium needed. Used it in our last MH that had an Onan 4000 in it and use it in our golf cart without any problems. The Stabil is important depending on how quickly you'll deplete the tank, but more important is making sure to start and run it at least once a month to get the standing fuel out of the bowl. The ethanol in the gas will start to build up a residue (looks sort of like white salt crusted on everything) quickly, especially in hot humid weather. I stupidly forgot to start our generator once for about 4 months and wound up having to replace the $300 carb due to the ethanol.
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Old 05-14-2015, 05:08 PM   #4
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Location: Idaho
Posts: 1,801
I have converted to premium, non-ethanol fuel for all my small engines, Honda Gen, lawnmower, snowblower, weed wacker and using Sea Foam.
Trailer: Lifted 228BH, heavy duty springs and Yokohama tires
TV: 2016 GMC Sierra Z71 4x4 CC, SLT
Spare TV: Two Alaskan Malamutes

Living somewhere in ID; previously lived in Moab UT; previous to that, don't ask!
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Old 05-14-2015, 05:16 PM   #5
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Join Date: Apr 2014
Location: Illinois
Posts: 86
I agree that a fuel stabilizer and regular starting is a must. As to octane I normally run 87 in everything. Staying away from ethanol blended fuels is a must in my book for small engines.
Mike & Kim Kilday
11' F250 6.7 SD
15' XLR 27HFS EP
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