My boxster seems unusually prone to this type of problem... Solution is to use a torque wrench to tighten plugs, which I've never done with any other vehicle. Previously, I alway just got them finger tight, and then just a little more.
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"Betty" -- 2000 Boxster S, Triple Black, loaded except PSM (sold to a good home)
"Veronica" -- 2008 Boxster S, Arctic Silver on Blue
"Maleficent" -- 2007 Cayman S, Red and Black, TPC Turbo 3.6L 460 RWHP, H&R RSS Coilover / TPC stage 2 suspension
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