Hi,
I have seen some case law concerning auto warranties. I'm not an Attorney, but to sum it up the finding was that a warranty isn't completely void if non-authorized maintenance or repair is done to the vehicle. But, the warranty covering that specific work may be. If AAA repairs a flat this could be considered unauthorized work, but Porsche could not void the warranty unless some subsequent failure could be directly linked to the repair that AAA did.
How much they will cover is anyone's guess. For instance, changing your Oil isn't technically working on the engine, it is working on the Lubrication System. Should another engine part, not related to the Lubrication system fail, Porsche would be bound by the case law to honor the warranty in this instance.
But, of course, this is the Legal perpsective and the only way to bring that to the forefront is to actually litigate it. I suspect that Porsche would deny a claim to the example I cited above and it would be up to the owner to argue with them until some understanding was reached or a suit begun.
Happy Motoring!... Jim'99
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