I don't have the warranty book handy but -- legally speaking -- it may not be up to the dealer to decide what the warranty rules are. I have a feeling that somewhere in there the rules state that scheduled maintenance must be done with a Porsche dealer to keep the warranty valid. One can decide to change oil or do other maintenance more frequently elsewhere (on top of the scheduled service at the dealer) and I also wonder what that may do to the warranty. Can anybody throw more light on this?
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