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I remember 20 odd years ago when Harley announced that it would not honor warranty claims if customers didn't use their oil. I think maybe (can't remember fer sure...) that they might have gone so far as to say that, in addition, the only way to verify is to have it changed at the dealership.
Lawsuits were filed. Harley lost. The court ruled that if that were a requirement, then Harley must perform that service for free. They dropped that requirement.
Granted, this is a bit different. I see no warranty requirements, just recommendations. I have to wonder, though, in this day and age, with such exceedingly stringent EPA requirements regarding oil additives, how much functional difference there actually is between different brands of similar oils. That, and materials technologies have advanced to the point where there are likely not any real differences between those used in the various manufacturers' engines.
In other words, probably all moot, and targeted at the less knowledgeable new car owner.
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