My experience may be atypical but I purchased an 04S with 29k miles 2 years ago from our local Porsche dealer. Since then I got new tires, did the 60K service at 30K since the car came with no maintenance history. Changed the trans fluid and filter and an annual oil change. I have not had any mechanical or electrical issues and have a bit over 40K miles on the car now And the IMS has not been changed. Rick
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