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Old 01-23-2018, 09:20 PM   #1
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Oasis Fluid Question

Okay so here’s the deal. It’s been fairly cold - low 30’s - so we’ve been cranking up the Oasis burner to bring the rig up to a comfortable inside temperature in the mornings. Working fine.

I just happened to pop the hood in the back and noticed my fluid level was about 1” below the Low/COLD mark.

Not knowing what to put in, checked the owners manual... it says : “use only a non-toxic propylene glycol based coolant with additives recognized as safe “GRAS” by the FDA in the Oasis Heating and Distribution Module..”

That sounds like regular car anti-freeze, but I’ve heard Century Fluid bandied about as well as warnings not to mix red and yellow...

I get this isn’t an Aqua Hot... But could some please tell me what exactly I should be topping my Oasis fluid off with? It’s confusing when it’s not really specified... thanks so much!
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Old 01-23-2018, 09:40 PM   #2
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The oasis fluid is similar to anti freeze but it is not the same. It is heat transfer fluid. Go to an RV dealer and get the right stuff. Heated antifreeze gives off toxic fumes, HTF does not.
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Old 01-23-2018, 09:44 PM   #3
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The oasis fluid is similar to anti freeze but it is not the same. It is heat transfer fluid. Go to an RV dealer and get the right stuff.


I’ve called several, and none carry it... can you advise a better quality brand name(s)... not even sure what to ask for... just hydronic heating fluid... seemed to confuse the RV stores as well.

Some carry the red stuff but I was told not to mix it... thanks.
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Old 01-23-2018, 09:47 PM   #4
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Originally Posted by LostDutchman View Post
I’ve called several, and none carry it... can you advise a better quality brand name(s)... not even sure what to ask for... just hydronic heating fluid... seemed to confuse the RV stores as well.

Some carry the red stuff but I was told not to mix it... thanks.
Can’t really give you a brand name. My dealer gave me a jug when I picked my coach. I’d give Newmar a call.
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Old 01-23-2018, 09:48 PM   #5
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Okay. Calling ITT/Oasis tomorrow. Thanks for your help. Safe travels!
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Old 01-23-2018, 09:51 PM   #6
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Just searched amazon for rv heat transfer fluid and it turned up some Century product recommended for aqua hot. Same color as the oasis juice anyway. They also call it antifreeze.
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Old 01-23-2018, 09:52 PM   #7
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CW carries Camco fluid, it's pink and is what is in my AquaHot. The Camco shouldn't be mixed with the greenosh Century fluid as the color can fool technicians into thinking there's corrosion in the unit.
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Old 01-23-2018, 10:53 PM   #8
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I have had the same issue and called ITR and they said that if i had to add some fluid distilled water would work in a pinch I had to add about 1/2 gallon to the recovery bottle and have had no problems
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Old 01-24-2018, 03:14 AM   #9
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Century fluid on Amazon is where I bought with ITR's blessing. Expensive though!
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Old 01-24-2018, 06:19 AM   #10
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Old 01-24-2018, 06:24 AM   #11
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We used the system a lot these last few days here in Quartzsite... caught me off guard when the level dropped some. I hate not having what I need on hand and certainly don’t want to hurt the system. Thanks for responding everyone... if ANY of the literature had just mentioned keeping some on hand with one or two suggestions on brands I would not have to jump through these hoops. Safe travels everybody!
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Old 01-24-2018, 09:35 AM   #12
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Drop is probably just the normal action as the system is used and gets remaining air out of the lines. See if there is a Newmar dealer on your travel route and check the price with them. My local dealer was about 1/3 less than Amazon which was totally a surprise.
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Old 01-24-2018, 06:25 PM   #13
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Quote:
Originally Posted by LostDutchman View Post
Okay so here’s the deal. It’s been fairly cold - low 30’s - so we’ve been cranking up the Oasis burner to bring the rig up to a comfortable inside temperature in the mornings. Working fine.

I just happened to pop the hood in the back and noticed my fluid level was about 1” below the Low/COLD mark.

Not knowing what to put in, checked the owners manual... it says : “use only a non-toxic propylene glycol based coolant with additives recognized as safe “GRAS” by the FDA in the Oasis Heating and Distribution Module..”

That sounds like regular car anti-freeze, but I’ve heard Century Fluid bandied about as well as warnings not to mix red and yellow...

I get this isn’t an Aqua Hot... But could some please tell me what exactly I should be topping my Oasis fluid off with? It’s confusing when it’s not really specified... thanks so much!
DO NOT use anything but the recommended Oasis Century antifreeze. Anything else can cause problems and likely void your warranty. Just simply call ITR or Newmar and they will ship you what you need.

As far as the overflow goes, just don't let it go below the cold line. We watch ours and always have some on hand since it is not readily available. Once it gets within a half inch of that line we add some. Until all of the air bubbles are gone your tank level will drop,
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Old 01-24-2018, 10:22 PM   #14
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I just purchased this from Amazon. I ordered on Monday night and it was delivered today about 11. About $25 with Ca tax
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