clydedoerr
Hardeeville SC
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Joined: 06/23/2005
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I use Mobil 1 15W50 in my 2007. Manual recommends 15W40 in hot weather That little air cooled engine needs all the help it can get when it gets above 100 degrees in my opinion.
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tombabbit
CA
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Joined: 12/23/2006
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I called Onan tech support a couple of years ago. The Tech support guy said 15-40 is recommended and synthetic is OK. He then went on to suggest using whatever I used in my engine.
Tom
2006 Vectra
2007 Jeep Wrangler
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Cousin_Eddy
Peoria, AZ
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Joined: 01/23/2006
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I put Castrol Syntec 20W-50 in mine cause we run at 115F ambient.
The manual says that a higher "W" viscocity reduces oil consumption.
1995 33' Southwind Fleetwood Model LW
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CaBoy
Junction City, OR USA
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Joined: 02/20/2003
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tombabbit wrote:I called Onan tech support a couple of years ago. The Tech support guy said 15-40 is recommended and synthetic is OK. He then went on to suggest using whatever I used in my engine.
Tom
My last 2 gas Onan's called for straight 30 weight, unless in very cold temps which isn't your case. That said many of us running 15W-40 in the engine also use it in the Onan to simplify carrying just one oil. I haven't talked to a Onan tech but there have been many post on this site relaying that Onan tech's at RV rallies say 15W-40 is great.
The older I get, the better I used to be.
1997 Prevost by Country Coach
470 HP Series 60 Detroit / 6 SP. Allison
2005 Jeep Grand Cherokee Toad
Same Co-Pilot for 43 years
2 Boston Terrier girls, Scooter & Mia
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Movie Man
Tennessee
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Joined: 01/04/2005
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Yeap, 15W40. I called Cummins Onan when i bought my rig and the tech said 15W40 and if you bring it to us it will get Valvoline Cummins Blue 15W40. So i buy Valvoline Cummins Blue 15W40 at Advance Auto Parts in a gallon jug and a Wix oil filter. Oh ,buy the way its a Onan 7000 gas genset.
Scott and Kim
2001 Tiffin Allegro Bay 36DB V-10 w/2 slides
20ft. Enclosed trailer toad with 2 racing Quads (ATVs) inside Honda TRX450R and Yamaha YFZ450 5004x4 Arctic Cat (Wife's)
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Tinstar
McKinney, TX
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Joined: 09/13/2003
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15W40 synthetic it is.
Thanks folks
 Never pass up a chance to go somewhere
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Pusher
Albuquerque, NM
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Joined: 12/17/2004
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I have a 6.5 Onan with almost 1100 hours on it. I was using 10-40 and thought I would try straight 30 weight. Smoked and used oil. I went to 10-30 Penzoil extra life and it quit smoking and does not use oil. 200 hours on it and no problems since I switched over. I use a Fram 3600 filter for the last 500 hours. Good luck.
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Sully2
Cincinnati
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Joined: 01/20/2003
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Movie Man wrote:Yeap, 15W40. I called Cummins Onan when i bought my rig and the tech said 15W40 and if you bring it to us it will get Valvoline Cummins Blue 15W40. So i buy Valvoline Cummins Blue 15W40 at Advance Auto Parts in a gallon jug and a Wix oil filter. Oh ,buy the way its a Onan 7000 gas genset.
BUT....let us not forget that the exact same engines that Cummins will use 15W-40 Valvolene Premium Blue in...they will ALSO use 5W-40 Valvolene EXTREME BLUE in...which is a synthetic!!!
2000 Country Coach Allure; Cummins ISC 330 HP; 71/2 - 8 MPG regardless
2002 Jeep Liberty
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Tinstar
McKinney, TX
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Pusher wrote:I have a 6.5 Onan with almost 1100 hours on it. I was using 10-40 and thought I would try straight 30 weight. Smoked and used oil. I went to 10-30 Penzoil extra life and it quit smoking and does not use oil. 200 hours on it and no problems since I switched over. I use a Fram 3600 filter for the last 500 hours. Good luck.
Pusher, are you saying it smoked after you put in the 30 weight and that's why you tried it; or it smoked after putting in the 30 weight and the 10W30 Penzoil fixed it?
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427435
Rochester, Mn
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Joined: 11/12/2005
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Pusher wrote:I have a 6.5 Onan with almost 1100 hours on it. I was using 10-40 and thought I would try straight 30 weight. Smoked and used oil. I went to 10-30 Penzoil extra life and it quit smoking and does not use oil. 200 hours on it and no problems since I switched over. I use a Fram 3600 filter for the last 500 hours. Good luck.
Why would you go from a 10w-40 to a 10w-30??? 
Mark
2000 Itasca Suncruiser 35U on a Ford chassis
2003 Ford Explorer toad with US Gear brakes,
ReadyBrute tow bar, and Demco base plate.
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