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07-29-2015, 03:59 PM
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#1
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Senior Member
Join Date: Jul 2014
Posts: 1,535
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Genny Oil
The 15w40 Rotella comes labeled for diesel. Is that the same oil you use for gas cummins generators?
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07-29-2015, 04:21 PM
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#2
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Senior Member
Join Date: Aug 2008
Location: Georgia
Posts: 8,638
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Quote:
Originally Posted by WDW
The 15w40 Rotella comes labeled for diesel. Is that the same oil you use for gas cummins generators?
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30w or 10w30 for like a gas 4000 best advise go to Onans web site.
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2007 Fleetwood Revolution LE 40V
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07-29-2015, 04:34 PM
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#3
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Senior Member
Join Date: Mar 2013
Location: Boise, Idaho
Posts: 715
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Quote:
Originally Posted by WDW
The 15w40 Rotella comes labeled for diesel. Is that the same oil you use for gas cummins generators?
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Yes! But don't use it in a gas engine with a catalytic converter or emission system. The diesel oil has more anti-wear additives like zinc and phosphorus.
These engines run hard and hot, I use Royal Purple HPS 10W-40.
Onan OEM manual calls for 15W-40 in severe duty.
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07-29-2015, 04:45 PM
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#4
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Senior Member
Join Date: Dec 2014
Location: High up in Arizona
Posts: 2,050
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Why not just use what the manual calls for? Seems like the best idea for everything, use what the manual calls for.
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07-29-2015, 05:47 PM
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#5
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Senior Member
Join Date: Mar 2013
Location: Boise, Idaho
Posts: 715
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Quote:
Originally Posted by 530ktm
Why not just use what the manual calls for? Seems like the best idea for everything, use what the manual calls for.
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Because there are better oils than the manual calls for......But if you like a shorter life on the engine that's a plus for them!
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2016 Thor Tuscany 34ST XTE, Freightliner XCR, ISB 360hp/800tq. Allison 3000, Koni FSD shocks, Roadmaster 1.75" front sway bar, Safe-T-Plus, DYI air bag flow control valves.
2015 Jeep Willy's Wheeler Wrangler Unlimited Toad, Ready-Brute-Elite tow system.
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07-29-2015, 05:54 PM
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#6
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Senior Member
Tiffin Owners Club
Join Date: Sep 2012
Location: Maryland
Posts: 1,432
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I have a Onan 7000 which is a gas generator and it calls for the 15w 40. When I had the genny at the Onan Cummins dealer I got filters and oil and that is what they sold me and yes it does say for diesel use.
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07-29-2015, 06:16 PM
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#7
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Senior Member
Join Date: Jun 2015
Location: The hilly part of Texas
Posts: 468
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Find the manual for your genny.
Find the page with Onan's oil recommendations....
Determine from the "expected ambient air temperature/oil grade" chart your expected ambient temperature between now and the next oil change and the recommended grade of oil. Example: you expect temps to range between 32F and 85F... 5W-30 might be the recommended grade...
Reputable oils carry a number of quality ratings....example SAE - SN, ILSAC, DEXOS, etc. ..indicating they meet certain industry test standards. Onan's oils meet industry standards. A little pricy but you only need about a quart. And for mine, 100 hr changes.
If it's an air cooled job, I'd stick to Onan oil in the suggested grade.
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07-31-2015, 09:58 AM
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#8
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,519
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The viscosity grade doesn't make an oil better or worse - the viscosity (aka "weight") is chosen for lubricity at the expected operating temperatures and engine specs. Using 40 weight oil rather than 30 wt is NOT doing your engine a favor if it was designed for 30 at that temperature range.
So use the viscosity the genset manual says for the expected temperature range. If you want to use a premium grade or a synthetic, that's your call, but use the viscosity the engine maker recommends.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
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07-31-2015, 01:31 PM
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#9
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,578
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Quote:
Originally Posted by WDW
The 15w40 Rotella comes labeled for diesel. Is that the same oil you use for gas cummins generators?
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I have Speedco do my genny service and they use that same oil!
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Joe & Annette
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2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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08-04-2015, 11:25 AM
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#10
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Senior Member
Join Date: Nov 2011
Location: Nation Wide Retired
Posts: 520
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Just use what the manual calls for.
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08-04-2015, 11:46 AM
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#11
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,519
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To answer the specific question, you can use Rotella diesel oil in a gasoline generator if the Rotella is rated for API Service SF/SL/SM in addition to CJ-4 (the diesel service class). I believe Rotella is rated for both gas and diesel, but not all diesel-grade oils will have dual certification. Always check the API service Class.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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08-04-2015, 07:14 PM
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#12
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Senior Member
Outdoors RV Owners Club
Join Date: Oct 2009
Location: Manitoba,Canada
Posts: 2,789
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I'm heading in a little different direction on this question.
I tried using 15W40 oil in my propane generator (which I assume is the same classification as a gas generator). I found that the generator was a little stiffer to start up on cold mornings than I liked. I switched back to 10W30 oil in my generator for this reason.
Jim
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Canada, eh?
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08-04-2015, 07:39 PM
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#13
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Senior Member
Join Date: Jun 2015
Location: The hilly part of Texas
Posts: 468
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Quote:
Originally Posted by Papa_Jim
I'm heading in a little different direction on this question.
I tried using 15W40 oil in my propane generator (which I assume is the same classification as a gas generator). I found that the generator was a little stiffer to start up on cold mornings than I liked. I switched back to 10W30 oil in my generator for this reason.
Jim
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And how cold was your cold? 15W should be OK down to 10F.... 10W down to 0 F..... I'd consider cold temps affecting battery capacity or battery heading south or connections. AND, it's an LP "vapor" engine. LP does not vaporize well in cold weather and it may be difficult to get the correct mixture for starting. LP is generally OK down to about 0 F.
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08-04-2015, 09:38 PM
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#14
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Senior Member
Newmar Owners Club
Join Date: Jun 2012
Location: Spicewood Texas (West of Austin)
Posts: 4,511
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Quote:
Originally Posted by WDW
The 15w40 Rotella comes labeled for diesel. Is that the same oil you use for gas cummins generators?
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I would use a synthetic in an air cooled gas engine. JMO.
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