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Originally Posted by JackG
It's called marketing.
Notice how Mobil 1 meets so many specs? That's because there's not 2 cents worth of difference between them, and it's not rocket science to meet them. But, as we know when it comes to getting a manufacturer's blessing (think Porsche approved tires), there's a cost involved in getting that blessing. Not having it doesn't mean you don't meet, or exceed it. As a manufacturer of oil, you pay for the privilege of putting that spec on your bottle. It's about money.
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I hope this isn't developing into an AMSOIL or REDLINE thread.
