Dexcool/Peak coolant
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Northstar Engines and System Technical Discussion Discussion, Dexcool/Peak coolant in Cadillac Engine Technical Discussion; Hi Its now a year since I changed coolant in my 99 STS 50000miles, that time I used Dexcool. Now ...
  1. #1
    lusen42 is offline Cadillac Owners Member
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    Dexcool/Peak coolant

    Hi
    Its now a year since I changed coolant in my 99 STS 50000miles,
    that time I used Dexcool.
    Now I have drained most of it because of a alternator-bearing job.
    When I went to bye Dexcool yesterday the shop showed me "Peak global
    life time", they recomended it and said that they only use that brand now.
    Do you guys think its a safe produkt or should I stick to Dexcool?
    If I change to Peak could it be a problem if I still have a half gallon
    one year old dexcool in the system.
    /Swed

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  3. #2
    misfit6794 is offline Cadillac Owners Connoisseur
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    Re: Dexcool/Peak coolant

    There's alot of info on this subject is you do a search on the forum. EVeryone here seems to have different opinions, here's mine. All the experiences I have had with dexcool (I've had several gm cars) have been negative. In both cars the coolant turned to mud after 20,000 miles. I switched to prestone (the kind for all makes and models) in those cars and in my northstar (after fixing my hg) with no negative effects, and the coolant didn't turn to mud. You can and should get ALL the dexcool out if you decide to switch. I recommend the prestone all make all model,and think dexcool is poison for the cooling system, but thats just me.

  4. #3
    lusen42 is offline Cadillac Owners Member
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    Re: Dexcool/Peak coolant

    Hi
    I have searched for info of the specific PEAK coolant in this forum, but not
    found anything. I like to follow GM recomendations and it seems like they
    now recomend PEAK (in Sweden) instead of DEXCOOL so it would be nice to hear if some someone have any experiance (good or bad) of PEAK.
    /Swed

  5. #4
    Zorb750 is offline Cadillac Owners Connoisseur
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    Re: Dexcool/Peak coolant

    It works fine.

    It has a better anti-corrosion package than dex cool and a better pH value for aluminum engines. The lifetime thing comes from the design of the inhibitor package, though in my belief it hasn't been on the market long enough to make that claim.

  6. #5
    dwight.j.carter's Avatar
    dwight.j.carter is offline Cadillac Owners Connoisseur
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    Re: Dexcool/Peak coolant

    I am interested however I think this has been discussed before. I would gladly switch to it if they garauntee my head gaskets during that lifetime not to fail !

  7. #6
    dwight.j.carter's Avatar
    dwight.j.carter is offline Cadillac Owners Connoisseur
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    Re: Dexcool/Peak coolant

    Wow looks like it is an Ethelyne glycol base still. Ranger have a look and tell us what you think ? I just did my coolant in the spring and won't be doing it again for a while but like I said previously I would be willing to try it if they fix my car if it gets old and eats through the head gaskets.

  8. #7
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Dexcool/Peak coolant

    "A complete cooling system flush and fill is required. Follow vehicle's owner's manual for specified maintenance. For all limited warranty details, including maintenance requirements and claims processing information, please use our "contact us" form"

    I'd be leary of any "Lifetime" coolant unless someone without a vested interest convinced me otherwise. Like GM perhaps.

    Go to their site. http://www.peakantifreeze.com/peak_global_lifetime.html
    Click on "Warranties" at the bottom. They only warranty radiator, heater core, thermostat & water pump and in no case shall they be liable for more than $1000.

  9. #8
    Zorb750 is offline Cadillac Owners Connoisseur
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    Re: Dexcool/Peak coolant

    Base is irrelevant. Ethylene glycol won't break down. It will still prevent freezing and boiling when it gets old.

    Life is a function of the inhibitor package, and as I noted earlier, I don't quite believe it either. Seriously though, is changing every couple years too much to ask?

  10. #9
    lusen42 is offline Cadillac Owners Member
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    Re: Dexcool/Peak coolant

    Today I installed the alternator with new bearings and a new rotor.
    The small bearing had rotated on the shaft of the old rotor so I had
    to swap it.
    I filled the system with PEAK and a can of "golden bar leak".
    I hope this coolant is at least as good as dexcool.

  11. #10
    Submariner409's Avatar
    Submariner409 is offline If it won't run, slap in a big stereo
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    Re: Dexcool/Peak coolant

    I hope you diluted the PEAK to 60/40 or 50/50, whichever gets you to the lowest freeze point, probably around 60/40.

  12. #11
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Dexcool/Peak coolant

    a can of "golden bar leak".
    I think you used the wrong stuff. You should use nothing other than Barsleaks tabs (HDC) or the powdered version (G12BP).

  13. #12
    fubar569 is offline Cadillac Owners Fanatic
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    Re: Dexcool/Peak coolant

    Quote Originally Posted by Ranger View Post
    I think you used the wrong stuff. You should use nothing other than Barsleaks tabs (HDC) or the powdered version (G12BP).
    even my dealer had the gm tabs for under 5 bucks...i just got those and skipped all the crap...

  14. #13
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Dexcool/Peak coolant

    Just for clarification, the Barsleaks tabs and the dealer tabs are the exact same product.

  15. #14
    Zorb750 is offline Cadillac Owners Connoisseur
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    Re: Dexcool/Peak coolant

    Quote Originally Posted by submariner409 View Post
    I hope you diluted the PEAK to 60/40 or 50/50, whichever gets you to the lowest freeze point, probably around 60/40.
    Lowest freeze point? I don't think so... you want the best compromise. Usually you want 50% mix because it is a good balance between carrying heat (more water is better) and freezing/boiling protection (more coolant is better). Will it be -30 degrees where you are?

  16. #15
    MisterBlue is offline Cadillac Owners Fanatic
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    Re: Dexcool/Peak coolant

    Oxygen sensors are VERY sensitive to silicone (it ruins them in short order). I figure the switch to Dexcool was probably prompted by the increased "leaking head gaskets" problem GM was experiencing. Ordinary (silicate-based) coolants can rapidly damage oxygen sensors if the coolant gets into the exhaust (which is highly likely). The Dexcool, containing no silicates, is far less likely to damage oxygen sensors.

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