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05-26-2018, 02:37 PM
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#1
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Senior Member
Monaco Owners Club
Join Date: Sep 2016
Posts: 1,055
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which fluids to use in generator?
now that my (1995 onan 7.5 DKD) generator is generating and my voltmeter is voltin’, i need to change my (i believe original) oil and coolant.
yep, you read that right ... based on previous owner’s comments, “we NEVER used the generator” and the fact that it only had 186 hrs on it when we got it last may. (the fluid tests for oil & coolant indicate they’re toast.)
the gen service page in my owners guide says it needs MIL-L-2104C, CC, CD or CE oil ... no “common0 oil that i’ve heard of is called by those descriptors ... so what oil should i put in?
i’m off to napa to buy double sets of filters so i can change current then refresh after 10-15 hrs on the new fluids.
thx for any / all feedback.
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05-26-2018, 03:05 PM
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#2
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Senior Member
Join Date: Jan 2016
Posts: 724
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Just bought oil for my Marquis Gold 7000. This is what the manual says for mine
__________________
2005 Allegro Bay 34XB, W22 Chassis / 8.1L
2013 Honda Fit toad, Demco Dominator & base plate
RVi2 Brake System, EezTire TPMS
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05-26-2018, 03:08 PM
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#3
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Senior Member
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,925
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The oil specifications for CC, CD, CE are all obsolete ratings. I'd use a 15W40 oil meeting the diesel specifications. The most recent 'donut' symbols to look for is CK-4. From the Cummins Onan RV Generator HandbookPg 26: " Diesel Engine Oil Quality – Use oil meeting any of the following API performance categories: CF, CF-4, CG-4, CH-4, CI-4 or CJ-4 where CJ-4 is currently the highest quality available. The use of synthetic oil is not recommended during the warranty period. The use of oil meeting API performance category CF-4, CG-4, CH-4 or CI-4 while burning fuel with a sulfuric content greater than 0.5% or CJ-4 while burning fuel with a sulfuric content greater than 0.0015% is not recommended as oil service is negatively impacted." Page 26 in that handbook also has a chart showing viscosity at different temperature ranges.
Looks like Kxbronco posted the same info.
__________________
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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05-26-2018, 04:03 PM
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#4
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Registered User
Winnebago Owners Club
Join Date: Feb 2018
Posts: 1,336
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We use Rotella 15W-40 oil as mentioned and Final Charge coolant, both from Walmart.
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05-26-2018, 04:23 PM
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#5
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Senior Member
Monaco Owners Club
Join Date: Sep 2016
Posts: 1,055
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great info, thx very much ... i’m on it.
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05-26-2018, 04:32 PM
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#6
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Senior Member
Join Date: Jun 2012
Location: AB
Posts: 7,587
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Quote:
Originally Posted by Radacravitz
now that my (1995 onan 7.5 DKD) generator is generating and my voltmeter is voltin’, i need to change my (i believe original) oil and coolant.
yep, you read that right ... based on previous owner’s comments, “we NEVER used the generator” and the fact that it only had 186 hrs on it when we got it last may. (the fluid tests for oil & coolant indicate they’re toast.)
the gen service page in my owners guide says it needs MIL-L-2104C, CC, CD or CE oil ... no “common0 oil that i’ve heard of is called by those descriptors ... so what oil should i put in?
i’m off to napa to buy double sets of filters so i can change current then refresh after 10-15 hrs on the new fluids.
thx for any / all feedback.
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To keep it simple, use the same fluids as you use in the engine of the coach...
__________________
2019 Unity LTV CB, pushed by a 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake
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05-26-2018, 10:35 PM
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#7
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Senior Member
Monaco Owners Club
Join Date: Sep 2016
Posts: 1,055
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Quote:
Originally Posted by dennis45
To keep it simple, use the same fluids as you use in the engine of the coach...
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much the same conclusion i’d come to, thx very much!
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05-27-2018, 04:13 PM
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#8
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Senior Member
Join Date: Mar 2017
Posts: 363
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Use 15W40, brand your choice.
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05-27-2018, 05:19 PM
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#9
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Senior Member
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,925
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Quote:
Originally Posted by Mhcorrigan
Use 15W40, brand your choice.
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I don't believe all 15W40 oils are rated for diesel use. I haven't cruised the oil aisle of stores lately, but before I knew what to buy for my diesel beetle, I was surprised at how few oils were rated for diesel use.
__________________
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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05-28-2018, 10:07 AM
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#10
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Member
Join Date: Mar 2010
Posts: 95
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I use Mobil 1 Turbo Diesel Truck 5W-40 Motor oil. Its a little expensive but you only need 3 Qt. Mobil 1 doesn't break down or gunk up when it gets hot. I also run my generator about once a month for about 15 minutes. This is the main recommendation from a Onan service tech to keep the generator ready for when its needed.
__________________
2005 HR Scepter 38PDQ
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05-28-2018, 10:49 AM
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#11
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Senior Member
Join Date: Jul 2014
Posts: 35,317
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Quote:
Originally Posted by skibum61
I use Mobil 1 Turbo Diesel Truck 5W-40 Motor oil. Its a little expensive but you only need 3 Qt. Mobil 1 doesn't break down or gunk up when it gets hot. I also run my generator about once a month for about 15 minutes. This is the main recommendation from a Onan service tech to keep the generator ready for when its needed.
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Only 15 minutes, Onan says 1 or 2 hours at 1/2 load.
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05-28-2018, 10:52 AM
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#12
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Senior Member
Monaco Owners Club
Join Date: Sep 2016
Posts: 1,055
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Quote:
Originally Posted by 2008Seneca
We use Rotella 15W-40 oil as mentioned and Final Charge coolant, both from Walmart.
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I bought these and now it's time to get to work ... I got the talkin' part done.
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