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03-19-2011, 06:29 PM
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#1
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Senior Member
National RV Owners Club Workhorse Chassis Owner
Join Date: Dec 2008
Posts: 301
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Synthetic in Onan 5500 HG JAB
I called Onan the other day and was told NOT to use synthetic oil in my 2005 Onan 5500 Marquis Gen. with 300 hrs on it. He didn't know why...just said don't use it. It's hard for me to believe that a good quality, full synthetic oil would not be good for ANY gas engine. I know that Onan wants you to use their own oil for obvious reasons, but I guess I'm just stupid or something.
Can anyone tell me why I really SHOULDN'T use synthetic in my gen.
Bill
__________________
BILL & CINDA SCHWARTZ
2005 SEABREEZE LX 8360
W-22 WORKHORSE 8.1 LTR.
BEAUTIFUL PHOENIX, AZ
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03-19-2011, 08:07 PM
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#2
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,713
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I don't see any reason not to use synthetic either, except maybe cost. You can use any oil that meets the service spec, which will be some viscosity, e.g. 10W30 and API service classification, e.g. SH or SL.
Current Onan gas gensets specify API SH, SJ or SG and SAE 30 if over 32 degrees or 15W40 if 0-100 degrees. 10w30 is allowed if temps are in the range of 0-80.
http://www.cumminsonan.com/www/html/...s/983-0101.pdf
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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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03-20-2011, 02:53 AM
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#3
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Sep 2007
Posts: 2,976
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i changed my oil when i first got the moho with about 49 hrs on the genny. i installed amsoil 10w30 synthetic oil. i have put about 25 hrs on it with no problems. it has not used any oil.
my onan 5.5 holds exactly 2 qts of oil with a filter change. i had to start it and leak check it and shut it off before i could put the balance of the second qt in the crankcase.
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01 WINNEBAGO 35U W20.8.1L 5sp allison SW Wa,. Good Sam, SKP. RVM 198 AMSOIL fluids. BANKS ecm program. SCAN GAUGE II w/ Ally temp. 2 LIFELINE GPL-6CT AGM Batts on their sides. Michelins, TST tptts. K&N panel air filter. AERO mufflers. TAYLOR plug wires. ULTRA POWER track bar. KONI fsd shocks, toad '21MB GLA FWD on dolly
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03-20-2011, 05:34 AM
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#4
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Senior Member
Join Date: Oct 2006
Posts: 455
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FYI Shell Rotella T meets Onan's specs.
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2006 Fleetwood Bounder 35E
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03-20-2011, 08:10 AM
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#5
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Senior Member
Join Date: Jan 2010
Posts: 474
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The reason Onan tells you not to use synthetic is that most of them are not available in the correct weight and have lowered levels of ZDDP additive required to meet the new API SL requirements that only apply to gasoline motor vehicle engine oils.
Shell Rotella T6 Synthetic is a 5W40 and will meet all the requirements for your air cooled Onan and has the higher level of anti-wear additives desired by Onan. It also meets the API requirements but does not have to lower the zinc levels as its primarily diesel engine oil.
By the way, 10w30 is only for use in the Onan air cooled gen sets if the ambient tems STAY consistantly below 80degF. If its below 80, why would you be running the gen set under load, you surely don't need AC.
Just use the recommended 5W40 syn or 15w40 conventional diesel engine oil, not the 10w30.
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38ft 2008 Damon Daybreak 3575 (forward kitchen)on Ford 22,000lb chasis, 242" WB.
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03-20-2011, 11:22 AM
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#6
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Senior Member
Workhorse Chassis Owner
Join Date: Nov 2003
Location: Mesa, AZ USA
Posts: 1,806
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Quote:
Originally Posted by WSRG
I called Onan the other day and was told NOT to use synthetic oil in my 2005 Onan 5500 Marquis Gen. with 300 hrs on it. He didn't know why...just said don't use it. It's hard for me to believe that a good quality, full synthetic oil would not be good for ANY gas engine. I know that Onan wants you to use their own oil for obvious reasons, but I guess I'm just stupid or something.
Can anyone tell me why I really SHOULDN'T use synthetic in my gen.
Bill
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I changed the oil/filter in my 5.5KW Onan 2 days ago. It had 549 hours. I used 10W 30 as usual. I finally bought a end cap style wrench. The one that was in the manual bag is too big and even this one is a mite big. I had to put a piece of paper towel as a shim. Works fine.
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Wretched excess is just barely enough.
2002 Itasca Suncruiser - WH Chassis - 35U - 2006 Jeep Liberty
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03-20-2011, 01:17 PM
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#7
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Jul 2010
Location: Anderson,IN
Posts: 407
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Quote:
Originally Posted by jcthorne
The reason Onan tells you not to use synthetic is that most of them are not available in the correct weight and have lowered levels of ZDDP additive required to meet the new API SL requirements that only apply to gasoline motor vehicle engine oils.
Shell Rotella T6 Synthetic is a 5W40 and will meet all the requirements for your air cooled Onan and has the higher level of anti-wear additives desired by Onan. It also meets the API requirements but does not have to lower the zinc levels as its primarily diesel engine oil.
By the way, 10w30 is only for use in the Onan air cooled gen sets if the ambient tems STAY consistantly below 80degF. If its below 80, why would you be running the gen set under load, you surely don't need AC.
Just use the recommended 5W40 syn or 15w40 conventional diesel engine oil, not the 10w30.
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Genset should be run at 1/2 load or better at least once a month or you'll be buying new carb $180.00 bucks,because these carbs are throw aways.If you check your owners manual you should see it under exercise genset.
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03-20-2011, 05:44 PM
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#8
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Senior Member
Monaco Owners Club Florida Cooters Club
Join Date: Nov 2010
Location: DeLand, Fl
Posts: 324
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You SHOULD use a good real synthetic oil. I and many others use Amsoil products.
__________________
If at first you don't succeed, skydiving is not for you.
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03-21-2011, 11:56 AM
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#9
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Senior Member
Join Date: Jan 2010
Posts: 474
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The WORST thing I ever did to my old Emerald 6.5 in our previous coach was replace the OEM carb with an Onan replacment. The OEM was made in mexico the replacement, although in an Onan box, was a cheap chinese copy that never worked correctly. I tore it down several times to replace parts that did not fit, or work as designed but it NEVER ran right. Even the Onan tech I paid $140/hr to tune it could not make it run right. Thier answer? buy another carb and try again.....
Keep the OEM carb and rebuild it. Do NOT buy the chinese replacement.
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38ft 2008 Damon Daybreak 3575 (forward kitchen)on Ford 22,000lb chasis, 242" WB.
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03-21-2011, 12:41 PM
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#10
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Community Administrator
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Sep 2010
Location: Marquette, Michigan "Da UP" & Lehigh Acres Florida
Posts: 21,827
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Quote:
Originally Posted by jcthorne
T Even the Onan tech I paid $140/hr to tune it could not make it run right. Thier answer? buy another carb and try again.....
Keep the OEM carb and rebuild it. Do NOT buy the chinese replacement.
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That's got to be infuriating
__________________
John & Cathy R.
06 Pace Arrow 38L Workhorse W24
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03-21-2011, 04:30 PM
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#11
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Jul 2010
Location: Anderson,IN
Posts: 407
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Quote:
Originally Posted by jcthorne
The WORST thing I ever did to my old Emerald 6.5 in our previous coach was replace the OEM carb with an Onan replacment. The OEM was made in mexico the replacement, although in an Onan box, was a cheap chinese copy that never worked correctly. I tore it down several times to replace parts that did not fit, or work as designed but it NEVER ran right. Even the Onan tech I paid $140/hr to tune it could not make it run right. Thier answer? buy another carb and try again.....
Keep the OEM carb and rebuild it. Do NOT buy the chinese replacement.
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Marquis Gold 5.5,6.5 and 7000 series gensets have carbs that are not rebuildable,once their gummed up their junk.
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03-22-2011, 07:01 PM
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#12
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Senior Member
Workhorse Chassis Owner
Join Date: Aug 2010
Location: Parker, CO
Posts: 185
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I used the 15w-40 oil when I serviced my Onan last year. When I was at the NAPA store buying the air & oil filters, I mentioned to the guy I was surprised it called for a diesel rated oil. Counter guy told me it was probably for the higher detergent & additive levels-made sense....
__________________
2011 Ford F250 Lariat C/C 6.7 PSD-Curt 20k Lb Hitch
2013 Infinity 3860MS 5'er
2009 Jeep Wrangler Sahara/U.S. Navy 1978-1986
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