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"...no prestige is bestowed on a marque for having the longest oil change interval, nor is there "shame" in a shorter interval. ..."
Perhaps I wasn't clear enough. Actually, as I said, Porsche DOES gain by recommending a longer interval, as it lowers the perceived cost-to-own (maintenance costs) of their cars in the eyes of potential buyers, thus making them more marketable and competitive. Porsche may have decided that the slight increase in wear (thus increase in warranty claims) is worth that increase in marketability. The equation for the owners is different, as they only care about minimizing wear. Whenever there's such misalignment of interests, it's worth to be more careful and buy insurance (change oil more frequently).
Z.
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