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SD987:
As I mentioned before, your theory also doesn't shed any light on why Porsche picked 20k. The marketing benefit could have been achieved by selecting 16k, or 17.5k, and yet they made it 20k. Think the marketing guys said, "hey, let's go with 20k cuz it sounds like alot"? Perhaps, perhaps not. As I said, I suspect 20k is actually understated.
They had to pick A number. My point is that the equations that they used to come up with that number have variables (marketing, etc.) that I personally don't care for. I only know that those variables will only make the recommended interval longer than what's optimal by my equation -- by how much, I don't know (unknown = risk).
Adding to this MNBoxster's list of varying driving conditions only compounds the risks and the unknowns. Some people take those risks head on and don't buy any insurance -- and many of them may come out financially ahead in the end. For me, the more frequent oil changes are cheap insurance in light of the risks we just discussed.
Z.
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