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The reason it was stated not GM approved is because its not on GM's very short list of oils that they have tested. Its not that its not as good as the ones they list, just that it was not submitted for testing. Will they not honor warranty work if you use it....time will tell. Personally I love the Royal Purple products. I have seen first hand what they can do, but if i think they may be reason for causing problems then I wont use them. Ill just use the GM approved brands.
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