STP High mileage oil additive.
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Northstar Engines and System Technical Discussion Discussion, STP High mileage oil additive. in Cadillac Engine Technical Discussion; I'm going to change my oil next week, and for starters I'm going with Quaker State Defy-their high mileage stuff ...
  1. #1
    CadillacLuke24's Avatar
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    STP High mileage oil additive.

    I'm going to change my oil next week, and for starters I'm going with Quaker State Defy-their high mileage stuff with some ZDDP added in. My DeVille has 65,525 miles on it, but the earlier Northstars are flat-tappet cammers, so I figured it'd be a good idea to start early. Now to my question: I also noted some STP high mileage oil additive, which also has ZDDP, and I'm thinking about gettin' that too.

    Is this a case of too much of a good thing? Or is it fine?

    Or did I just start Oil War 10,124,593???

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    Re: STP High mileage oil additive.

    Quote Originally Posted by CadillacLuke24 View Post
    I'm going to change my oil next week, and for starters I'm going with Quaker State Defy-their high mileage stuff with some ZDDP added in.
    Is this a case of too much of a good thing? Or is it fine?
    That's all you need.

    Is this a case of too much of a good thing? Or is it fine?
    Yes, this is a case of more is not better.

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    Re: STP High mileage oil additive.

    No oil war, and NO STP ANYTHING !!!

    The QS Defy is all the extra additive package you need.

    QS is part of the Shell/Pennzoil/QS umbrella: SOPUS (Shell Oil Products U.S.) and Shell packages several different brands of HD engine oils that conform to the older SJ or SL oil designations.

    Your engine was spec'd for either a SH (obsolete) or SJ (2001 and earlier) API oil service, so the conventional "High Mileage" oils will be just fine.

    http://www.api.org/certifications/en...010_120210.pdf

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    Re: STP High mileage oil additive.

    Sweet! QS Defy 10W-30 it is. I'll have to put that 5 bucks to good use.....like a bottle of car wash mix


    Thanks guys!

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    Re: STP High mileage oil additive.

    Not sure about your comment "with some ZDDP added in...........".

    The QS Defy additive package, as-is, would not need anything extra dumped in, and excess ZDDP absolutely kills catalytic converters. Unless you have all the spec sheets for all the lubricant products you want to use, and are a very good chemical mixing engineer, better safe than sorry ................

    Get into www.joegibbsdriven.com and read up on wild engine oil formulations. Another reference source, and a good one, is the AMSOIL site.

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    Re: STP High mileage oil additive.

    Some years ago, STP paid the FTC the largest consumer fraud fine in history because their products did nothing they were claimed to do.
    Don't mess with Binky Bear!


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    Re: STP High mileage oil additive.

    I believe that Andy Granatelli was involved in that fiasco - ??? and the Slick50 mess also ???

    Time and time again the wildly optimistic snake oil claims prove to be either sort of false or flat lies.

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    Re: STP High mileage oil additive.

    Yup, that was Granatelli and that Slick50 snake oil.

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    Re: STP High mileage oil additive.

    Quote Originally Posted by Submariner409 View Post
    Not sure about your comment "with some ZDDP added in...........".

    The QS Defy additive package, as-is, would not need anything extra dumped in, and excess ZDDP absolutely kills catalytic converters. Unless you have all the spec sheets for all the lubricant products you want to use, and are a very good chemical mixing engineer, better safe than sorry ................

    Get into www.joegibbsdriven.com and read up on wild engine oil formulations. Another reference source, and a good one, is the AMSOIL site.
    What I meant is that QS Defy seems, to me, like regular QS with ZDDP added in. I will be swapping my current batch of oil with straight from the bottle QS Defy, 7 quarts in the pan, and .5 in the Purolater Gold filter (lubing the filter gasket while I'm at it), and nothing else.

    Sorry for the confusion. Thanks a TON for the help.

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    Re: STP High mileage oil additive.

    I think you are confused. Regular QS has ZDDP. All motor oils do. The high Mileage stuff just has a little more.

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    Re: STP High mileage oil additive.

    Ok. So Defy and other HM oils just have MORE. Gotcha.

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    Re: STP High mileage oil additive.

    Not to over state the obvious.

    The "newer" oils are so thin that they are basically insufficient to protect the older engines. So basically, I have to pay probably more for something that "used to" be basic engine protection?! Now, call it what you want, it sounds like another way to remove that last of the older cars on the road to purchase a "newer" car?

    What a hustle....

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    Re: STP High mileage oil additive.

    And they charge ya a extra buck or two for the fancy High mileage oil.
    98eldo32v and 98eldo32v like this.

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    Re: STP High mileage oil additive.

    Quote Originally Posted by 98eldo32v View Post
    The "newer" oils are so thin that they are basically insufficient to protect the older engines.
    Not true. SL, SM and SN engine oils have each had a somewhat lesser zinc and phosphorus additive package (ZDDP) in order to conform to the latest knee-jerk dictates of the EPA: Catalytic converters now must be certified for ??? 120,000 ??? miles, and ZDDP in sufficient quantity kills today's 3-step catalytic converters.

    BUT - lower ZDDP levels also remove part of the anti-scuff protection that older flat-tappet engines need.

    Oil viscosity choices remain the same - the EPA-recommended oils for automotive engines carry the starburst symbol; high mileage and HD fleet oils which have a higher ZDDP (not much, but better) package do not get the starburst - they get the simple API rating "donut" symbol.

    Read the links in Posts #3 and #5.

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    Re: STP High mileage oil additive.

    Here is the oil ratings and ZDDP content.
    Attached Images

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