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I use certain additives for certain things. They certainly aren't for well maintained, good running cars. Can additives free up lifters, raise compression or reduce oil consumption ? Sometimes, maybe.
In any case, it isn't up to the oil manufacturer to certify additives, it is up to the additive manufacturer. And what is appropriate for a 911 under warranty really has no bearing on what someone might do to get a few more months out of a car that is next door to scrap.
In that case, how an additive might effect wear characteristics of a certain oil might go right out the window.
But maybe there is another way to look at this. If you are a hammer, everything looks like a nail. If you are an oil analyst, you analyze oil. If you work a Wall Mart, maybe using automotive products sold at Wall Mart makes sense. And works.
There, but for the Grace of God...
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