Why is he your Porsche mechanic? What other cars in his shop are getting what kind of work? My mechanic would have several engines in tear down and several cars in race prep. That is how I know they knew Porsche.
I don't see many postings on the forums I frequent that say that a qualified installer installing a quality IMS replacement kit leads to problems. I'm sure there are some but I can't recall one in the last 8 years and over a half dozen forums on three continents.
As for that every 3 years, that is outdated info with respect to many bearing suppliers.
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