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14,726 Posts
The dexos1 specification is nothing but GM being blood-sucking leeches. It is nothing more than an oil tax and a way for them to screw everyone for more money there is absolutely no other reason to require a royalty on oil sales. They require royalties and a significant certification cost in order to certify, so AMSOIL has opted not to. AMOSIL OE, XL, and Signature Series exceed the dexos1 specifications. The certification expense and per-gallon royalty is substantial and is not required. AMSOIL has refused to certify on a number of occasions and this, being the worst offender, is certainly not going to be an exception.
Your warranty will stay intact. GM cannot deny your warranty for your choice of lubricant and they know this. The dexos1 requirement is there to ensure you don't go out and put crappy conventional oil in your turbocharged engine, not to ensure you use their crappy oil quality and nothing better.
Of course your dealer doesn't want you to do anything else; they don't make money if you change your own oil. It's funny that they tell you to run a "fully synthetic" oil, since that to them means selling you overpriced Mobil 1, which isn't really even considered a true synthetic oil to begin with.
Your concern is about nothing more than GM trying to screw you out of more money on maintenance.
I have yet to find a better oil for this car than AMSOIL Signature Series and I've researched a lot of foreign brands and boutique oils. If you find one, let me know. I sure as **** wouldn't drain AMSOIL SS to put in an inferior oil to appease a dealership who has absolutely no legal authority to comment on your choice of lubricant. The only time they have any right to comment is if a failure occurs and they have reason to believe the oil was responsible for it. I've seen shredded synchros and blown turbos in this car and not once was the oil considered suspect. Your dealer is certainly not interested in the legal can of worms they'd open by suggesting that using a better oil would void your warranty.
Your warranty will stay intact. GM cannot deny your warranty for your choice of lubricant and they know this. The dexos1 requirement is there to ensure you don't go out and put crappy conventional oil in your turbocharged engine, not to ensure you use their crappy oil quality and nothing better.
Of course your dealer doesn't want you to do anything else; they don't make money if you change your own oil. It's funny that they tell you to run a "fully synthetic" oil, since that to them means selling you overpriced Mobil 1, which isn't really even considered a true synthetic oil to begin with.
Your concern is about nothing more than GM trying to screw you out of more money on maintenance.
I have yet to find a better oil for this car than AMSOIL Signature Series and I've researched a lot of foreign brands and boutique oils. If you find one, let me know. I sure as **** wouldn't drain AMSOIL SS to put in an inferior oil to appease a dealership who has absolutely no legal authority to comment on your choice of lubricant. The only time they have any right to comment is if a failure occurs and they have reason to believe the oil was responsible for it. I've seen shredded synchros and blown turbos in this car and not once was the oil considered suspect. Your dealer is certainly not interested in the legal can of worms they'd open by suggesting that using a better oil would void your warranty.