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Old 05-26-2018, 02:37 PM   #1
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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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Old 05-26-2018, 03:05 PM   #2
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Just bought oil for my Marquis Gold 7000. This is what the manual says for mine
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Old 05-26-2018, 03:08 PM   #3
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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.
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Old 05-26-2018, 04:03 PM   #4
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We use Rotella 15W-40 oil as mentioned and Final Charge coolant, both from Walmart.
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Old 05-26-2018, 04:23 PM   #5
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great info, thx very much ... i’m on it.
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Old 05-26-2018, 04:32 PM   #6
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Quote:
Originally Posted by Radacravitz View Post
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.
To keep it simple, use the same fluids as you use in the engine of the coach...
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Old 05-26-2018, 10:35 PM   #7
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To keep it simple, use the same fluids as you use in the engine of the coach...

much the same conclusion i’d come to, thx very much!
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Old 05-27-2018, 04:13 PM   #8
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Use 15W40, brand your choice.
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Old 05-27-2018, 05:19 PM   #9
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Use 15W40, brand your choice.
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.
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Old 05-28-2018, 10:07 AM   #10
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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.
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Old 05-28-2018, 10:49 AM   #11
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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.
Only 15 minutes, Onan says 1 or 2 hours at 1/2 load.
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Old 05-28-2018, 10:52 AM   #12
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Quote:
Originally Posted by 2008Seneca View Post
We use Rotella 15W-40 oil as mentioned and Final Charge coolant, both from Walmart.
I bought these and now it's time to get to work ... I got the talkin' part done.
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