High Mileage oil ?
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, High Mileage oil ? in Past Cadillac Vehicle Discussion; My baby just joined the "high mileage" club reaching 75k miles. I use Quaker State platinum or ultra which I ...
  1. #1
    Tonyny's Avatar
    Tonyny is offline Cadillac Owners Fanatic
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    High Mileage oil ?

    My baby just joined the "high mileage" club reaching 75k miles. I use Quaker State platinum or ultra which I get at Walmart. First question is regarding the ultra version -- is it worth the extra coin? Finally is the high mileage oil of any benefit or just marketing hype? Thanks

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    Submariner409's Avatar
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    Re: high mileage oil

    Your roller cam Northstar engine is not "High mileage." ANY of the 5W-30 oils, either synthetic or conventional, will be just fine for your engine. Quaker State is now part of the SOPUS (Shell Oil Products US) umbrella which includes Shell and Pennzoil. Follow your OLM and go way up ^^^ to the top black bar and study the Cadillac Technical Archive - all of it.

    The high mileage oils may or may not contain seal-swelling chemicals and slightly increased levels of ZDDP (a zinc-phosphorus anti-scuff compound contained in all engine oils), but it's not necessary in your engine.

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    JimD is offline Cadillac Owners Connoisseur
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    Re: high mileage oil

    Quote Originally Posted by Tonyny View Post
    My baby just joined the "high mileage" club reaching 75k miles.
    Not quite. Less than 200,000 miles should not be considered "high mileage" on a modern engine.
    You can thank unleaded fuel and today's oil additive chemistry for the dynamic definition of "high mileage".
    I use ....
    I sense yet another oil war coming over the horizon.
    ....Finally is the high mileage oil of any benefit or just marketing hype?
    Marketing hype.
    Your engine was designed for and was driven off the assembly line filled with 5W-30 'Starburst' dinosaur oil.
    There is no measureable benefit to you from using (high dollar) "high mileage" or "synthetic" oils.
    The Owner's Manual is your friend.

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    basscatt's Avatar
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    Re: high mileage oil

    Quote Originally Posted by Tonyny View Post
    My baby just joined the "high mileage" club reaching 75k miles. I use Quaker State platinum or ultra which I get at Walmart. First question is regarding the ultra version -- is it worth the extra coin? Finally is the high mileage oil of any benefit or just marketing hype? Thanks
    ---------------------
    I agree with Sub -
    you don't need it - there will be absolutely NO benefit to using it -

  6. #5
    CadillacLuke24's Avatar
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    Re: high mileage oil

    Flat-Tappet cammers- Any Northstars 1999 and older-"High Mileage" oils with increased ZDDP levels are a GOOD idea.

    Roller cammers-Northstars 2000 and newer- No apparent benefit from "High Mileage" oils.
    jounier11 and jounier11 like this.

  7. #6
    SGWORLDWIDE's Avatar
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    Re: high mileage oil

    "Quick jumpin penguins batman" lets burry the thread before we have another oil war

  8. #7
    SUPER LAC DEVILLE's Avatar
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    Quote Originally Posted by basscatt
    ---------------------
    I agree with Sub -
    you don't need it - there will be absolutely NO benefit to using it -
    Ah, but No Harm Either, right?

    While 10/30 is the viscosity recommendation the brand or "blend" doesn't seem to be any issue other than preference for Packaging

    However, I prefer the Shell Rotella 15/40, NO BLEND for my 186k mileage 98 Deville...

    Jus a Preference tho

  9. #8
    MoistCabbage's Avatar
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    No. Just money wasted.

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    SUPER LAC DEVILLE's Avatar
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    Quote Originally Posted by MoistCabbage
    No. Just money wasted.
    Yea but all brands and viscosity have various price ranges so its jus a matter of what you're willing to spend on your budget

    ----------

    Quote Originally Posted by Tonyny
    My baby just joined the "high mileage" club reaching 75k miles. I use Quaker State platinum or ultra which I get at Walmart. First question is regarding the ultra version -- is it worth the extra coin? Finally is the high mileage oil of any benefit or just marketing hype? Thanks
    Who told you that was high mileage for your 2003 DTS?

    ----------

    Quote Originally Posted by SGWORLDWIDE
    "Quick jumpin penguins batman" lets burry the thread before we have another oil war
    I love the oil wars

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    Submariner409's Avatar
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    Re: high mileage oil

    SUPER LAC, Would you believe me if I said that running 15W-40 truck oil in a Northstar is costing you a bit of gas mileage ?

  12. #11
    SUPER LAC DEVILLE's Avatar
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    Quote Originally Posted by Submariner409
    SUPER LAC, Would you believe me if I said that running 15W-40 truck oil in a Northstar is costing you a bit of gas mileage ?
    That may be true

    But last night was my best run

    Reset Avg MPG, fuel used and trip

    55mph high way
    10 miles trip
    0.4 gallons fuel used
    24 avg mpg

  13. #12
    SUPER LAC DEVILLE's Avatar
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    Quote Originally Posted by Tonyny
    My baby just joined the "high mileage" club reaching 75k miles. I use Quaker State platinum or ultra which I get at Walmart. First question is regarding the ultra version -- is it worth the extra coin? Finally is the high mileage oil of any benefit or just marketing hype? Thanks
    Your vehicle has only averaged about 20/25 miles per day for 10 years...

    That's pretty much the normal work and grocerie shopping use

  14. #13
    Submariner409's Avatar
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    Re: high mileage oil

    Quote Originally Posted by SUPER LAC DEVILLE View Post
    55mph high way
    10 miles trip
    0.4 gallons fuel used
    24 avg mpg
    Your car should easily average 26 - 28 mpg highway. My STS does 25 .........

  15. #14
    SUPER LAC DEVILLE's Avatar
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    Quote Originally Posted by Submariner409

    Your car should easily average 26 - 28 mpg highway. My STS does 25 .........
    Yes
    But remember befor the FPR change it wouldn't get over 14 or 15 mpg avg and 19 was the limit on that 300 mile round trip I took a couple months ago

    Plus this was a 10 mile drive around 15 min

    It prolly will get that high 26/28 mpg on a longer trip

  16. #15
    donwon is offline Cadillac Owners Enthusiast
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    Re: high mileage oil

    Quote Originally Posted by Submariner409 View Post
    SUPER LAC, Would you believe me if I said that running 15W-40 truck oil in a Northstar is costing you a bit of gas mileage ?
    I know it cost me a couple of mpg in my 4.9.
    I have a friend who talked me into using 5-w-15 Valvoeine and my olm came on about 3500 miles instead of the 5000+ miles with 15-w-40 Rotilla that I normally use.

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