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The "spirited" theory arose, IIRC, from comments by Jake early in the "IMS-is-a-problem" history when he observed that frequently driven and spiritedly driven cars seemed to have less IMS failure problems.
My guess is that frequently and spirited result in warm oil being splashed at higher temps and pressures, less condensation in the oil or perhaps the inner seal is kept more flexible/effective.
Don't know if he still feels the same way nor do I know of any statistical study on the subject.
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