Recommended coolant

Discussion in ''Da Nailhead' started by gsman66, Apr 13, 2019.

  1. gsman66

    gsman66 Only in Texas....

    It's time to change coolant / antifreeze in both cars. Last time I used Zerex Dexcool. What would you guys recommend for the nailheads? GS has a re-cored original radiator and the Special has a Griffin aluminum radiator. I've been looking at Prestone GM Dexcool concentrate which specially states it's protects aluminium.

    BTW, I did searches on the forums looking for recommendations but struck out...

  2. telriv

    telriv Well-Known Member

  3. TORQUED455

    TORQUED455 Well-Known Member

    Regular old green stuff
    Mark Demko likes this.
  4. jmos4

    jmos4 Well-Known Member


    I use regular green stuff, you should google dexcool as there were numerous issues with it when it first came out and know of many that ditched it for the green stuff.

  5. BadBrad

    BadBrad Got 4-speed?

    The old car with the 'spensive aluminum radiator gets fresh coolant every year; so I go with the cheapest available.
  6. Houmark

    Houmark Well-Known Member

    I use a 50/50 blend of the old blue stuff for iron engines.. Havn't had any problems..

    I'm from Denmark, so could be the colors aint the same..
    Mark Demko likes this.
  7. Stevem

    Stevem Well-Known Member

    Evans period!
    Pricey but worth it !
    As with any motor if your rad cap is below the level of the T-stat, or any hose or part of the motor then be sure to burp the air out once the stat begins to open!
  8. 436'd Skylark

    436'd Skylark Sweet Fancy Moses!!!!!

    Nothing wrong with the green stuff.
    Mark Demko likes this.
  9. gs66

    gs66 Silver Level contributor

    Green stuff here too.
    Mark Demko likes this.
  10. TrunkMonkey

    TrunkMonkey Well-Known Member

    Prestone ethylene/diethylene glycol 50/50, in my nailhead with copper/brass radiator and heater core.

    (no cats were harmed in the use of this product)
    Mark Demko likes this.
  11. Mark Demko

    Mark Demko Well-Known Member

    Go green
  12. gsx455-4ever

    gsx455-4ever Gold Level Contributor

  13. woody1640

    woody1640 Well-Known Member

    Zerex G05 is the best antifreeze for protecting aluminum.

  14. B-rock

    B-rock Well-Known Member

    my 65 has aluminum radiator and heater core, along with the aluminum intake and all the rest of the aluminum on a 455. I decided to run one the same type that all my other vehicles use. thats Zerex G05 Keeps everything very simple.
  15. 1972Mach1

    1972Mach1 Just some guy.....

    I run green in all my stuff, and it all has at least aluminum radiators and aluminum water pumps on cast iron blocks. Of course, I have to tear each of them down a couple times a year when they break, so the coolant is always fresh ;):(:D
    Mark Demko likes this.
  16. Mark Demko

    Mark Demko Well-Known Member

    LMAO, yeah mine is too, I put it in, I drain it out again, then put it back in, then repeat:rolleyes:
    1972Mach1 likes this.
  17. 1972Mach1

    1972Mach1 Just some guy.....

    I'm on round number 3 in my F100 already this year!
    Mark Demko likes this.
  18. gsman66

    gsman66 Only in Texas....

    Guys, thanks for the replies. Been busy with yard work and landscaping as well as the ever-present honey-do list that I haven't had a chance to get to the cars yet. Oil, filters, and coolant changes coming up soon. Will likely go with Prestone or Zerex.
  19. lemmy-67

    lemmy-67 Gold Level Contributor

    No Dex-Cool in iron engines. Turns everything to orange mud. Speaking from experience.

    Stick to normal green silicated coolant.
  20. Wildcat GS

    Wildcat GS Wildcat GS

    I`m running a `96 Suburban which I bought new. Its a beater work truck now. Over 350K, original engine/trans, and Dexcool from new. I had the rad shop put new tank orings in the original radiator at about 225K because the core looked that good. The core was then, and still appears now, as new. Dexcool has worked for me!
    I think folks run into issues with Dex when some yahoo adds the old green to it...or a leaky cooling system exposes the coolant to air continuously....or both!
    Tom Mooney

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