Our company cars are managed by GE Fleet Services (not the Boxster) and they still recommend a 4,000 mile interval service between oil changes. I would think GE has a LOT of data to suggest this is the best recommendation (risk vs reward). I have seen other fleet services that have a 5,000 interval. So, I don't think that Jiffy Lube is too far off, just a little more aggressive and profit motivated.
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