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Old 05-24-2011, 05:51 PM   #1 (permalink)
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Cummins coolant

What coolant do i use for my 04 5.9 Cummins? Napa said Zerex G-05? Is it safe? I thought you had to get coolant straight from the dealership.
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Old 05-24-2011, 06:03 PM   #2 (permalink)
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Copy/paste off DTR

1). Mopar 5 Year/100,000 Mile with (HOAT) Embittered - The Mopar Antifreeze/Coolant 5-Year/100,000 Mile — Embittered (Part No. 68048953AA concentrate) is available in one gallon containers. This HOAT G-05 formulated coolant is specified for the third generation to present Dodge Ram vehicles, as they are factory filled with 5-year/ 100.000 mile coolant. This coolant is red/orange in color.

2). Ford / Motorcraft Premium Gold Engine Coolant - Ford Part #VC-7A

3). Mercedes Benz Antifreeze Agent - Part # Q 103 0002

4). Valvoline Zerex G-05 Hoat - Available in concentrate. The NAPA part # is ZXG051. NAPA carries all of the Valvoline product line. If they do not have it on the shelves or behind the counter, a store associate can order it for you. Zerex G-05 has a service life of 5 years or 150,000 miles (250,000 km).

I have found that the Valvoline Zerex G-05 and the Motorcraft Premium Gold are the most cost effective choices vs the Mopar G-05 HOAT and the Mercedes Benz Antifreeze Agent.
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Old 05-24-2011, 06:14 PM   #3 (permalink)
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3 gallons of coolant and 3 of distilled water?
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Old 05-24-2011, 06:16 PM   #4 (permalink)
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Go with the Vavoline Zerex G-05, The HOAT formula is what was designed to be used with the cooling system. Available at NAPA, I did a flush on mine when i got a hole in my radiator make sure to use distilled water too.

You will need a lot more than what is needed to fill. Since you will drain all the coolant you can (some stays in the block) then run then drain and continue until you are stratified. I'll find the link that has a good write up for this.
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Old 05-24-2011, 06:21 PM   #5 (permalink)
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Check this out: 3rd Generation Dodge Cummins - Flushing The Cooling System
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Old 05-24-2011, 06:32 PM   #6 (permalink)
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Great link, great info! thanks!
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Old 07-02-2011, 01:35 PM   #7 (permalink)
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Great link. Thanks. Now to my unusual problem. I had trouble draining the radiator with the drain . I ended up unscrewing it all the way. Now it will not thread back in. Fooled with it over an hour in the Fla sun (92 degrees). I have started pulling the radiator to better see what is wrong, of if something broke, the first step of replacing the whole radiator (ouch--for a 75 cent plastic part). any suggestions?
PS. Got my Zerex from O"reilly auto parts stores

Last edited by Morris Stevens; 07-02-2011 at 01:36 PM. Reason: Added source for HOAT
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Old 07-02-2011, 02:12 PM   #8 (permalink)
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No radiator is fine I pulled mine out by mistake also its just it has to go in a certain way to go inside takes time did this too in miami weather
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Old 07-02-2011, 03:58 PM   #9 (permalink)
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Got the Radiator out through the front: Did not want to fool with the fan. Found the problem to be a swelled rubber washer that seals the hole when closed. Had to lubricate it (Not all 11") and it then could be forced in far enough for the threads of the thumb screw to catch. Now that I have it off I might replace the belt and water pump since these are now real easy to get to.
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Old 07-02-2011, 05:43 PM   #10 (permalink)
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i had the local dodge dealer check the coolant in my 2005 with 41K miles, when they serviced the transmission.
they said it was good with their test machine, said i should be good for 100k

should i depend on their report, my truck is not used for H/D service, just general home use and pulls mama's camper some.

great truck
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Old 07-02-2011, 07:49 PM   #11 (permalink)
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I would change the fluid every 50,000 miles its not too expensive and keeps everything running right I should know my radiator fluid was supposedly good but it messed up my water pump and blew all over my engine along with my belt what a mess. Just because its good for 100,000 miles doesnt mean it will work its best with 100,000... If you dont wanna take it from me take it from the ford 6.0
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Old 07-03-2011, 04:53 PM   #12 (permalink)
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I also need to add coolant. Advance sold me Prestone's Dex Cool. It says nothing about HOAT and I'm a little leary of it. All it says is it's for aluminum radiators. I have an 06 5.9.
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