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07-13-2021, 08:04 AM
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#1
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Senior Member
Vintage RV Owners Club Workhorse Chassis Owner
Join Date: Sep 2017
Posts: 721
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What oil for 4KY Onan?
My 1998 Onan gas-powered generator ops manual calls for SAE 30 (SG or SH) motor oil. My search for straight 30 weight oil is making me think it's not available except in "house" brands. Onan says 30 weight "is preferable when temps are consistently above freezing." I'm somewhat reluctant to go with a house brand.
Alternatively, Onan says 15W-40 (OnaMax) for 10 to 100 degrees Fahrenheit. Also having trouble finding that, other than by mail.
Found Castrol 10W-40 SG Motorcycle Oil. Seems like motorcycle engines would come closer to the operating environment of an RV generator (air-cooled, constant RPMs, etc.).
The generator only has 193 hours but I have no way of knowing when or if the original owner (I'm number 2) changed the oil or if it's original.
Leaving very soon on a 2k mile trip and suspect I'll be using the house air conditioner more often than not given the temps all over the country. As good as the ginny has been, I really would like to start out with new oil but can't decide.
Thoughts, especially from first-hand experience?
TIA
__________________
1998 Fleetwood Flair 25Y--P30 Chassis - 7.4 L - KD5ALG
"When I was younger, I could remember anything, whether it had happened or not." - Mark Twain
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07-13-2021, 08:07 AM
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#2
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Senior Member
Join Date: Mar 2016
Location: Arizona
Posts: 1,134
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I order the Onan 15w40 from Amazon for my 5500. My brother has always used straight 30 weight, and has over 1100 hours on his genny.
__________________
2016 Fleetwood Bounder 33C. Towing 2017 Jeep Wrangler Unlimited.
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07-13-2021, 09:22 AM
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#3
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Senior Member
Vintage RV Owners Club Workhorse Chassis Owner
Join Date: Sep 2017
Posts: 721
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RESOLVED but still interested in opinions.
Elwood58, was able to find 15W40 at Cummins in Tulsa. Was able to get two quarts put on hold until I drive by there in a couple of days. They said the 15W40 was their most popular, BTW, and only had five left in stock. Thanks for your input.
__________________
1998 Fleetwood Flair 25Y--P30 Chassis - 7.4 L - KD5ALG
"When I was younger, I could remember anything, whether it had happened or not." - Mark Twain
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07-15-2021, 02:15 PM
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#4
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Junior Member
Join Date: Nov 2016
Posts: 11
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GuyG: I've found at Walmart all different weights on the oils. Pick your preference. When it comes to oil, for example, my little Prius C has its oil changed every 5000 miles or sooner. I always viewed that as cheap insurance. And I change it whether it needs it or not!! And I'd bet that in the long, long run you are saving money that way. Try it. If you think it hasn't been changed or just not sure, change the damn oil ! You're talking about a few bucks here. Happy travels.
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07-15-2021, 08:04 PM
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#5
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Senior Member
Join Date: Jun 2016
Location: SW Louisiana
Posts: 8,954
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SAE 30 is commonly available from most major brands though it will generally be labeled the newer SN grade, I usually use 15W40 for my Onan 4000 KY as I have it on hand for various diesel engines.
__________________
2002 Safari Trek 2830 on P32 Chassis with 8.1L w/ 400 watts solar 420Ah LiFePo4
2017 Jeep Cherokee Overland & 2007 Toyota Yaris TOADs with Even Brake,
Demco Commander tow bar and Blue Ox / Roadmaster base plates
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07-15-2021, 10:20 PM
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#6
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Registered User
Join Date: Jul 2016
Posts: 1,042
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Quote:
Originally Posted by GuyG
My 1998 Onan gas-powered generator ops manual calls for SAE 30 (SG or SH) motor oil. My search for straight 30 weight oil is making me think it's not available except in "house" brands. Onan says 30 weight "is preferable when temps are consistently above freezing." I'm somewhat reluctant to go with a house brand.
Alternatively, Onan says 15W-40 (OnaMax) for 10 to 100 degrees Fahrenheit. Also having trouble finding that, other than by mail.
Found Castrol 10W-40 SG Motorcycle Oil. Seems like motorcycle engines would come closer to the operating environment of an RV generator (air-cooled, constant RPMs, etc.).
The generator only has 193 hours but I have no way of knowing when or if the original owner (I'm number 2) changed the oil or if it's original.
Leaving very soon on a 2k mile trip and suspect I'll be using the house air conditioner more often than not given the temps all over the country. As good as the ginny has been, I really would like to start out with new oil but can't decide.
Thoughts, especially from first-hand experience?
TIA
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I use Rotella T6 15w40 in mine. It runs well and burns very little. I have 800 hours on my Onan 5500.
Make sure you follow Cummins other maintenance specs such as air and fuel filter changes, spark plugs, valve adjustment etc. Also make sure you exercise it under load for 2 hours monthly when not in use.
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08-02-2021, 03:32 AM
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#7
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Registered User
Join Date: Aug 2016
Location: Seattle,WA/HB,CA./Fujieda-Japan
Posts: 849
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A great oil for an air-cooled generator is Valvoline VR-1 Racing (conventional) 10w-30. It is widely used in the ACVW/Porsche community.
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