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Old 02-25-2018, 10:24 PM   #29
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Rotella 15W-40 ok for propane generator?

I've always used Rotella 15W-40 in my previous two motorhomes with gas generators. Is Rotella ok for my propane generator in my Navion? I'd think the "engine" of the gen is virtually the same in gas or propane.
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Old 02-26-2018, 07:29 AM   #30
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Quote:
Originally Posted by Camper Ken View Post
I've always used Rotella 15W-40 in my previous two motorhomes with gas generators. Is Rotella ok for my propane generator in my Navion? I'd think the "engine" of the gen is virtually the same in gas or propane.
Although I use Rotella in my Onan Quiet Diesel, I prefer full synthetic in air-cooled engines. I always used synthetic in my previous Onan 5500.
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Old 02-27-2018, 07:43 PM   #31
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Onan doesn't make oil - they just make a big profit re-selling somebody's oil at a huge mark-up. Ditto for Onan filters. You don't need Onan brand fluids or filters.

Just buy the grade of oil recommended in the genset owner manual, which will almost surely be a diesel grade oil (API Service Class CH4) and a viscosity suitable for the temperature range (usually 15W40 but see your Onan manual for the temperature vs viscosity ranges). Any brand that has the API class and viscosity will be fine,
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Old 02-27-2018, 08:13 PM   #32
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Your right Gary.....I use the Valvoline Premium Blue 15W40 because that is what Cummins recommends in my owners manual.

I use the same in the generator since Onan/Cummins are one in the same and soon to drop "Onan" from the trademark equation.
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Old 02-27-2018, 08:27 PM   #33
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For those interested that do their own maintenance, the Valvoline Premium Blue 15W40 can often be found on sale for just about 12 bucks per gallon at Tractor Supply, O'Reilly's or Napa.

I just picked up 6 gallons at O'Reilly's here in South Florida for $11.99 per gallon on sale.

Add a Fleetguard LF9009 oil filter for $28.00 bucks and you have yourself a DIY $100.00 buck oil change!
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