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That discussion used to come up frequently when people wanted to put a different tune in their Corvette.
One lawyer, with experience in the field, said that a MM argument will get you exactly nowhere if you have changed something from the original specs and didn't get specific approval from the car maker to do so.
What actually happens is that if GM decides to deny a warranty claim involving a non-standard part, they just say "No".
You argue more and they still say No.
If you try to sue them, they'll bring out a bevy of their engineers who will explain all the evil things that could have happened from your mod, and they are the experts on your engine. You over-oiled the filter, or under-oiled it, or it just doesn't work properly. It's because they don't want to set a precedent that people can do mods and retain warranty coverage. Especially on those expensive engines.
Now, I've not heard of anyone getting denied warranty coverage because on a non-standard air filter. It probably wouldn't happen. You might get some support from your local BBB, or not.
But if you look at all the fuss people are (correctly) making about the bent/cracked wheels, and how many do indeed have the problem, and how well the legal system is working for them, you begin to see how it would work for one lonely owner by himself.
And the wheels are a totally stock part.
From my understanding of MM, the burden of proof rests with the manufacturer to prove/disprove any claim of an aftermarket part being at the root cause of any claim. GM just can't turn around and say it was a pothole (or some other convenient/lame excuse) like they are doing with C7 wheels. How often do you hear of anyone making a claim against GM where they have turned around and counter claimed that using an after market filter resulted in damaging your vehicle? I'm sure there are probably some garbage filter manufacturers selling low quality products that could be capable of doing this. It would be difficult for them to disprove a claim from using an after market part. Another consideration is GM does not warrant wheels however they do warrant their engines. GM appears to acknowledge that many GM vehicle owners are using aftermarkets parts. Take a look at this GM TSB I have attached. Specifically look at their "Note" on the bottom of the doc. Reading through it you get a sense GM is indifferent about accepting this practice but does not explicitly state not to use a aftermarket filter. GM must realize doing so would be over stepping their authority to make such a statement as MM clearly states they can't. I think it would be much easier to take GM to court (or through the BBB arbitration process) and win a claim on an aftermarket product for a warranted component than it would be for winning a case for an unwarranted component such as C7 wheels. The law is with the consumer. I myself feel very comfortable using quality after market replacement parts most of the time. Thanks for your reply BTW.