MrAmbassador Posted June 26, 2022 Share Posted June 26, 2022 Has anyone converted their Cummins Onan Generator from Glycol Antifreeze to OAT? If so what type/Brand of OAT did you use? Thank you. Link to comment Share on other sites More sharing options...
JDCrow Posted June 26, 2022 Share Posted June 26, 2022 I would be curious as well. I couldn’t flush my system, so I stuck with good ol green. 1 Link to comment Share on other sites More sharing options...
Old Dog Posted June 26, 2022 Share Posted June 26, 2022 I used the Cummins lifetime, running the same in both engines makes carrying spare fluid easier. 1 Link to comment Share on other sites More sharing options...
Tom Cherry Posted June 26, 2022 Share Posted June 26, 2022 I'm old fashioned and I don't plan on putting 250K on the Cummins or 10,000 hours on the Onan. I use a good, brand name of the HD Coolant that has the additive for the sleeves of the Cummins engines. I use that in the Onan as well as only carry one gallon as a spare and a pint of the SCA or whatever additive. Not knocking the advanced or lifetime coolant, but the Green Texaco is what came in mine and when Cummins changed it, they put in the Cummins Compleat....any good grade or same API rating of that is compatible. 1 Link to comment Share on other sites More sharing options...
weighman695 Posted June 26, 2022 Share Posted June 26, 2022 I have an onan Quiet Diesel 8000 generator and just bought the rig last year. My current engine and diesel coolants looks like greenish yellow. What is the brand and part number (or whatever you call it) do you use as your coolant? Manual says antifreeze of coolant must meet ethylene glycol or propylene glycol but no suggested brand and part number. 1 Link to comment Share on other sites More sharing options...
1nolaguy Posted June 27, 2022 Share Posted June 27, 2022 When we bought our 2005 Safari with a cat deisel engine and o an deisel 8k Gen. Aftee having all the fluids tested we opted to have both coolant systems flushed and the coolant replaced with Peak OAT 1,000,000 mile coolant. Not that I plan to put on that kind of mileage/time on either but it made sense to keep the coolant the same. 2 Link to comment Share on other sites More sharing options...
vito.a Posted June 27, 2022 Share Posted June 27, 2022 The older (prior to 2005) Onan diesel generators used Isuzu 3 cyl engines and the newer ones use Kubota 3 cyl engines. Neither version requires special diesel coolant because they are not wet sleeves (most are parent bore). Use the 50/50 mixed ethylene glycol coolant. Original coolant in Onan generator. - iRV2 Forums 2 Link to comment Share on other sites More sharing options...
Scotty Hutto Posted June 27, 2022 Share Posted June 27, 2022 I use Peak Final Charge Global Extended Life (OAT) in both my ISL400 and the Onan 8k QD genny. The Onan doesn’t require it, but I confirmed with Cummins it’s ok to use it. It’s easier to just carry a gallon of premix that works for both. Probably a silly reason to change to OAT, but I’m red/green colorblind and could never make sense of the test strips to tell if I needed to add SCA. OAT made that issue go away for me. 🤪 2 Link to comment Share on other sites More sharing options...
DoubleL Posted June 27, 2022 Share Posted June 27, 2022 This is what I am going to put in mine. Same thing I used in the engine. 1 Link to comment Share on other sites More sharing options...
96 EVO Posted June 27, 2022 Share Posted June 27, 2022 11 hours ago, Scotty Hutto said: Probably a silly reason to change to OAT, but I’m red/green colorblind and could never make sense of the test strips to tell if I needed to add SCA. OAT made that issue go away for me. 🤪 Good a reason as any! Even us who aren't colorblind have trouble reading those little strips. Link to comment Share on other sites More sharing options...
MrAmbassador Posted June 27, 2022 Author Share Posted June 27, 2022 Thank you everyone for your great insight!!! It was all very informative!!!! Link to comment Share on other sites More sharing options...
weighman695 Posted June 27, 2022 Share Posted June 27, 2022 2 hours ago, DoubleL said: This is what I am going to put in mine. Same thing I used in the engine. What color is this coolant/antifreeze? Thanks. Link to comment Share on other sites More sharing options...
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