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308 Coolant Suggestions or Preferences

Discussion in '308/328' started by robertgarven, Aug 15, 2019.

  1. robertgarven

    robertgarven F1 Rookie
    Rossa Subscribed Owner

    Feb 24, 2002
    4,970
    Ventura, California
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    Robert Garven
    Friends,

    I have been using dexcool in my 75 GT4 for 15+ years and change it every year and it comes out clear as a bell. My 74 GT4 had green yellow coolant and was just wondering with all the new formulas and varieties available, what may of you are using?

    Thanks

    Rob
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  2. miketuason

    miketuason F1 World Champ
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    Feb 24, 2006
    13,331
    Cerritos, CA.
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    Mike
    I have been using the BMW antifreeze non phosphorus for years with good results. It’s concentrated so I have to dilute it to 60% water and 40% antifreeze, except next time I might change it to 75% water and 25% antifreeze.
     
  3. moysiuan

    moysiuan Formula 3
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    Nov 1, 2005
    1,535
    Toronto, Canada
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    Andy
    The older style of "green" coolants work well with the combination of aluminum engine and brass radiator and expansion tank. Most modern engines have aluminum radiators and plastic expansion tanks. I have been using the Merecedes coolant for years, but after doing research realized the old green style was the best for the multi metals in the car, but switching between chemistries is also apparently not a good idea even thought most are all deemed compatible, so I stuck with the Mercedes for about 14 years now. It was a light amber, they changed to be blue now. I believe it is the OAT or HOAT chemistry, and that apparently does not protect the copper brass metals as well as the old tradtional formula. The new formulas have longer change intervals, but are not "better" per se in keeping corrosion to a minimum which is the main purpose of the coolant.
     
  4. thorn

    thorn Formula 3
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    Aug 7, 2012
    2,107
    Tallahassee, FL
    Prestone Green 50/50. Change it annually and works great.
     
  5. Mule

    Mule F1 Rookie
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    Jun 25, 2003
    3,454
    Alaska
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    Mule
    Same here. Simple, easy, cheap, available in Alaska. I probably don't get to it "every" year.
     
  6. lm2504me

    lm2504me Formula Junior
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    Aug 26, 2004
    500
    Nipomo, CA
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    Richard
    Shell Rotella ELC -green
    Replace every 4 years
     
  7. yelcab

    yelcab F1 Veteran
    Consultant

    Nov 29, 2001
    9,238
    San Carlos, CA
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    Mitchell Le
    The green stuff, 50/50 mix. Change it 12-24 months and you are fine.
     
  8. Brian A

    Brian A Formula 3

    Dec 21, 2012
    2,054
    SanFrancisco BayArea
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    1983 US 308 GTS QV
    I am unfamiliar with coolant chemistry but am surprised that color is an indicator of composition. I guess I therefore need to say I use "blue" coolant (I use BMW coolant which I believe is made by Pentosin).

    As I understand it, BMW had a problem with aluminum sulfites caused by casting very narrow water passages in some of their engine blocks. They began selling a BMW branded coolant with a formula which minimized sulfite deposits. … this is from memory; I might be making this all up.

    I can say with confidence that I drain only about half of the coolant each year from the system via the lower front heater hose. I never open the drain on the engine block. I do so because I never have problems with bleeding air when I do it this way. It may be just superstition. Because I drain only about half, I change that half every year.
     
    miketuason likes this.

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