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Northstar Engines and System Technical Discussion Discussion, High Mileage Northstar Thread: Who can beat me? in Cadillac Engine Technical Discussion; Please do some searching before starting another thread on a subject that is, and has, been covered extensively. This thread ...
  1. #271
    Submariner409's Avatar
    Submariner409 is offline If it won't run, install a sound system
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    Re: Northstar Engine High Mileage Club

    Please do some searching before starting another thread on a subject that is, and has, been covered extensively.

    This thread will be merged with the original, in Northstar Performance.

  2. #272
    sts777 is offline Cadillac Owners Member
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    Re: High Mileage Northstar Thread: Who can beat me?

    Is this engine still intact for all these miles? What major components have you replaced? And how is the transmission holding up? Do you use an oil additive? My '96 STS is at 426k...transmission went out at 377k.....just curious about your experience! Thanks,STS777.
    jounier11 and jounier11 like this.

  3. #273
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    Re: High Mileage Northstar Thread: Who can beat me?

    Which engine/member are you referring to ?

  4. #274
    HerkFCC is offline Cadillac Owners Member
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    Re: High Mileage Northstar Thread: Who can beat me?

    Just bought a 2001 Seville STS, 87,000 miles..rides like it's on a cloud and fast, too!
    Unrelated, my 1993 Seville 4.9L has 143,000 but will need a new motor unfortunately...she's going into storage until I can get her a new motor.

  5. #275
    Sherman4 is offline Cadillac Owners Member
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    Cool Re: High Mileage Northstar Thread: Who can beat me?

    My 1996 Deville Concours has 184900. The only significant issue I've had was a bad coilpack. It does consume a bit of oil as well. My transmission, however, is starting become problematic!

  6. #276
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: High Mileage Northstar Thread: Who can beat me?



    Go to the Technical Archives at the top left of this page and read up on oil consumption.

  7. #277
    CadillacLuke24's Avatar
    CadillacLuke24 is offline Cadillac Owners Connoisseur
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    Re: High Mileage Northstar Thread: Who can beat me?

    DrivenDeVille, UPDATE!


  8. #278
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
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    He probably hit 550k miles by now. Pretty impressive.

  9. #279
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    drivendeville is offline Cadillac Owners Member
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    Re: High Mileage Northstar Thread: Who can beat me?

    Quote Originally Posted by CadillacLuke24 View Post
    DrivenDeVille, UPDATE!

    There ya go..

  10. #280
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    Re: High Mileage Northstar Thread: Who can beat me?

    Thank you

    557,115 miles and still getting 27.8 average MPG. Northstar FTW!
    jounier11 and jounier11 like this.

  11. #281
    Mafiaman111 is offline Cadillac Owners Fanatic
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    Re: High Mileage Northstar Thread: Who can beat me?

    i think the shocking part is that there is not a single dummy light on like that guy on youtube driving around in his high mileage caddy with messages chimming on the dash and all the lights going crazy

  12. #282
    CadillacLuke24's Avatar
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    Re: High Mileage Northstar Thread: Who can beat me?

    He takes care of his car. VERY good care, as it's truckin' along with that many miles

  13. #283
    mtflight's Avatar
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    Re: High Mileage Northstar Thread: Who can beat me?

    Quote Originally Posted by drivendeville View Post
    There ya go..
    Awesome! How long have you owned your 98 and have you been running Dexcool all this time?

  14. #284
    Submariner409's Avatar
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    Re: High Mileage Northstar Thread: Who can beat me?

    Are you still under the impression that there is anything wrong with properly maintained DEX-COOL ? Your question would appear so .........

    Here's 2 quarts of 50/50 DEX-COOL from the truck engine with 88,900 miles on it (the engine) - the coolant is 3.5 years old. Just changed it all. Look like anything wrong there ?????

  15. #285
    mtflight's Avatar
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    Re: High Mileage Northstar Thread: Who can beat me?

    Quote Originally Posted by Submariner409 View Post
    Are you still under the impression that there is anything wrong with properly maintained DEX-COOL ? Your question would appear so .........

    Here's 2 quarts of 50/50 DEX-COOL from the truck engine with 88,900 miles on it (the engine) - the coolant is 3.5 years old. Just changed it all. Look like anything wrong there ?????
    It looks beautiful--almost good enough to drink! (edit: make sure to put skull and crossbones on it if you have any children in the family). Alas, I'm not concerned about the coolant itself more so than the head gasket. Tearing the engine down and looking at the head gasket would give a better picture of how well it is protecting it.

    The silicates in conventional green coolant coat carbon/carbon composites [graphite composite headgasket] and are used to make it oxidation resistant. Dex-Cool is a silicate-free coolant. It is wonderful in protecting aluminum, brass, cast iron, steel and copper, but offers no carbon/carbon protection. Our composite head gaskets are made of graphite (carbon), copper/brass, and felt, and a good portion of them are soaked in coolant.

    Other large manufacturers saw this protection void (and the lawsuit due to deterioration of silicone rubber and nylon gaskets), and opted to add silicates to their versions of long-life coolants, and they are now called Hybrid organic acid technology coolants. The added silicates coat and protect what the potassium 2-ethylhexaonate (hexaonic acid) doesn't. Toyota, Honda, Ford and probably others use this type of hybrid coolant. They prohibit the use of anything else, quite emphatically in some instances.

    How many 93-96 Northstar's have HG failure vs 97-99 before the better headbolts? They are otherwise virtually the same engine--are they not??

    **edit: I'm not saying that there aren't any failures on 93-96 or that the observation negates the other flaws such as torque-to-yield head bolts, or a flaky gaskets. I'm saying those head gaskets may be very vulnerable to fail in as it is with all the expanding and contracting cycles of the aluminum or the graphite and the steel bolts... The straw that breaks the camel's back or rather precipitates the failure could be a coolant that lacks corrosion/oxidation protection to graphite. A renowned polymer expert I work with confirmed it for me: graphite does in fact corrode/oxidize readily if uncoated, it burns or flakes.

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