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Generator Oil


aunut

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Our previous mh had the Cummins-Onan 7000 gas genie and we used 15w/40 Rotella or Tech 2000. Both available at Walmart. Cummins can get kind of picky if you don't use the recommended oil weights and a problems were to occur.

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Our Onan operator's manual simply recommends using an oil with an API rating of SF . No particular weight of oil other than what the chart of weight to temperature has .

Here is that chart . Note that it includes 15W40 . I have used diesel oil in gas motors with no ill effects .

 

oil%20chart_zps3yrz6mbc.jpg

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I'd say then that any oil that meets or exceeds the SF rating (SF SG SH SJ SL SM SN) and matches the temp range expected is going to be fine.

 

I'd look for a GF-5 and SN rated oil as it is the latest spec for gas engines according to the PDF I linked above.

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Our Onan operator's manual simply recommends using an oil with an API rating of SF . No particular weight of oil other than what the chart of weight to temperature has .

Here is that chart . Note that it includes 15W40 . I have used diesel oil in gas motors with no ill effects .

 

oil%20chart_zps3yrz6mbc.jpg

Looks like I do need 15w40 It gets pretty hot down here. But, I don't understand why 10w30 and 10w40 have the exact same ranges.

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Our previous mh had the Cummins-Onan 7000 gas genie and we used 15w/40 Rotella or Tech 2000. Both available at Walmart. Cummins can get kind of picky if you don't use the recommended oil weights and a problems were to occur.

The Rotella 15w/40 from Wal-Mart is what I've used on my Onan 5500. If you're picky you can purchase Onan's brand oil at either an Onan repair facility or Camping World. The choice is yours. Dave.

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The Rotella 15w/40 from Wal-Mart is what I've used on my Onan 5500. If you're picky you can purchase Onan's brand oil at either an Onan repair facility or Camping World. The choice is yours. Dave.

I assume tht Rotella is made for diesels. But, according to other posts, it shouldn't matter?

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It sounds like you want the best for your generator with out getting the wrong oil. Why don't you then get the Onan brand oil from an Onan repair facility or from Camping World? Then you have peace of mind. It will be costly but I think you only need 2 qts. so it isn't that much more. Dave.

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It sounds like you want the best for your generator with out getting the wrong oil. Why don't you then get the Onan brand oil from an Onan repair facility or from Camping World? Then you have peace of mind. It will be costly but I think you only need 2 qts. so it isn't that much more. Dave.

You're exactly right. It's about a 50 mile round trip, but I think I'll bite the bullet.

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A fifty mile drive each way when Amazon has it?

 

http://smile.amazon.com/Cummins-3265336-Onan-SAE-15W-40/dp/B00278MET8/ref=sr_1_1?ie=UTF8&qid=1425868461&sr=8-1&keywords=onan+oil

 

http://smile.amazon.com/MOTORHOME-TRAILER-AUTOMOTIVE-ENGINE-ONAN/dp/B000BRJV5W/ref=sr_1_3?ie=UTF8&qid=1425868461&sr=8-3&keywords=onan+oil

 

 

All said, dinosaur oil is pretty much dinosaur oil as long as the weight and APIs match or exceed your needs so I'd just buy something locally that meets your requirements.

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A fifty mile drive each way when Amazon has it?

 

http://smile.amazon.com/Cummins-3265336-Onan-SAE-15W-40/dp/B00278MET8/ref=sr_1_1?ie=UTF8&qid=1425868461&sr=8-1&keywords=onan+oil

 

http://smile.amazon.com/MOTORHOME-TRAILER-AUTOMOTIVE-ENGINE-ONAN/dp/B000BRJV5W/ref=sr_1_3?ie=UTF8&qid=1425868461&sr=8-3&keywords=onan+oil

 

 

All said, dinosaur oil is pretty much dinosaur oil as long as the weight and APIs match or exceed your needs so I'd just buy something locally that meets your requirements.

Stan,

 

You bring up a good point. Does the gen. manufacturer recommend or disallow synthetics? When I bought my Honda 2000i the dealer filled it with synthetic and that is what I have used since.

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A fifty mile drive each way when Amazon has it?

 

http://smile.amazon.com/Cummins-3265336-Onan-SAE-15W-40/dp/B00278MET8/ref=sr_1_1?ie=UTF8&qid=1425868461&sr=8-1&keywords=onan+oil

 

http://smile.amazon.com/MOTORHOME-TRAILER-AUTOMOTIVE-ENGINE-ONAN/dp/B000BRJV5W/ref=sr_1_3?ie=UTF8&qid=1425868461&sr=8-3&keywords=onan+oil

 

 

All said, dinosaur oil is pretty much dinosaur oil as long as the weight and APIs match or exceed your needs so I'd just buy something locally that meets your requirements.

 

Seems a better deal here : http://www.pplmotorhomes.com/parts/onan-generators/onamax.htm

 

I use the proper weight and rated dino oil in our Onan . Never a problem . It has a touch less than 800 hours on it .

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Usually the manufacturer just ignores the synthetic issue unless they require it (for real or marketing reasons) and just give weights and API requirements.

 

I'm sure it is available cheaper many places, I just use Amazon as my default place to look for stuff I'll never buy because it confuses the heck out of their ad system. :-)

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Stan brought up a good point. I also ordered my oil & filter from amazon. At the time gas was $3.50 a gal. & I would have to drive 70 mi. each way to get the oil& filter. So, it was actually cheaper to order it on line & have it sent to me in a couple of days. Now I keep a spare filter on board. Dave.

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Stan,

 

You bring up a good point. Does the gen. manufacturer recommend or disallow synthetics? When I bought my Honda 2000i the dealer filled it with synthetic and that is what I have used since.

I did talk with Onan about synthetic oil. They said yes, but maintain service intervals.

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I'm a fan of using synthetic oil and changing it annually. With less than 2 quarts needed, the price is no factor. But I do the same for my motorhome Triton V-10 as well, so.........

 

I don't think you can necessarily equate "Onan" oil with "the best" oil. It is what they can buy at the lowest price, and I'm sure it's made for their label by some big-name company.

 

When in doubt, get some Mobil 1 at Wally World and off you go!

 

Roy

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