My concern about oil change interval is not about miles, its about time. I can never reach the miles in a single year that would require me to change the oil in my Z. I change the oil at the end of each driving season / year before putting the car in storage. On the topic of oil use, I have not had any oil use issues with either of the Z's I currently own or have owned in the past. Like it's been said, I am going on personal experience.
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