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Thread: Red VS Green Coolant again!!!

  1. 25th January 2016, 09:16 PM #81
    PAT303
    PAT303 is offline OldBushie
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    Quote Originally Posted by rick130 View Post
    My Tdi was 11 years on Land Rover/Caltex/Dexcool OAT (from the factory ! It was the last of the Tdi's) and for the last five years on Cummins-Fleetguard HOAT and the core was still fine and clean and leak free until I had it re-cored with a HD Redback core this year.

    Ok, I'm on my second water pump, I'd have to go back through the forum to see when the original went, I think it was around the 250,000km mark where the bearing failed, not the seal.
    I'm not changing my stance on OAT Rick,I've got too many memories digging out corroded bolts and heli coiling threads to do that . Pat
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  2. 26th January 2016, 02:52 PM #82
    superquag
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    Green (glycol) is better... if for no other low-tech reason that the pong of a leaking hose/radiator/etc. is both unmistakable and panic-inducing... both valuable signaling characteristics !
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  3. 26th January 2016, 08:03 PM #83
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    rick130
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    Quote Originally Posted by superquag View Post
    Green (glycol) is better... if for no other low-tech reason that the pong of a leaking hose/radiator/etc. is both unmistakable and panic-inducing... both valuable signaling characteristics !

    OAT is glycol too !

    It's just the inhibitor package that use an organic acid (a carboxylic acid) as the inhibitor rather than silicates and/or nitrates.

    IIRC the problem with Texaco/Caltex Dexcool/Land Rover OAT in it's original formulation was it used 2EHA as the acid, and this reacted with silicon based seals, softening and creating water leaks, and reacted with air creating a god awful sludge in some engines.
    I think most all OATS don't use 2EHA anymore.
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  4. 26th January 2016, 08:39 PM #84
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    ozscott
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    This is the one i am using. The 4.6 is certainly running cool with 84_87 water temp typical.

    http://www.acdelco.com.au/coolant_dexcool.html

    Cheers
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  5. 26th January 2016, 08:46 PM #85
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    ozscott
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    Is does contain 2-Ethylhexanoic acid. My understanding that the early problems with some V6 GM motors was.due to the gasket composition not being compatible....i think that is a thing of the past. Cheers

    Cheers
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  6. 26th January 2016, 09:01 PM #86
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    rick130
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    Quote Originally Posted by ozscott View Post
    Is does contain 2-Ethylhexanoic acid. My understanding that the early problems with some V6 GM motors was.due to the gasket composition not being compatible....i think that is a thing of the past. Cheers

    Cheers
    Yep, it was a silicon based seal they used on valley gaskets and the coolant went past the seal.

    Oops.
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