Quote:
Originally Posted by Idyll
Dexos is a great oil for those more concerned with their cats than their engines, as that's the primary focus of dexos. Personally, I prefer the additive package in Mobil 1 0W-40 European Formula as it's more focused on sulfated ash, phosphorus and sulfur (full SAPS). It doesn't carry the dexos 2 label because a full SAPS oil shouldn't be used in diesels with particulate filters, and GM wants a single additive package that can be used across their entire fleet (gas and diesel).
What's funny is I never see anyone pushing dexos in any of the non-GM cars they have in their garage. It's like the engines and cats in GM cars are somehow unique from the other 60 automotive manufacturers around the world and only a dexos additive can save them from certain destruction.
P.S. Ever wonder why dexos isn't Dexos, with a capital D? Because if GM requires you to use a specifically named branded product for warranty compliance, then they'd be required to provide that product to the customer. GM says dexos is not a brand, but simply an additive that they in turn get royalties for by having the label on oil bottles.
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Interesting. Besides the obvious protection for catalytic converters, I never really dug deep into the reasons GM is pushing this particular spec on their customers. Are these cats different or did GM have to replace a bunch of oil fouled cats under warranty? Who knows
To support your point, the owner's manual does state the track duty specific oil is regular Mobil1 15w-50, which I presume is not dexos certified. I can't speak for everyone, but I'm pretty sure we don't want to void our powertrain and/or emissions system warranties by using incompatible oils.