Delta
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The spark plug thing may go okay with an independent but not dealers. That would be 2 separate RO's, one for the warranty (warranty is fussier than health insurance about what they pay for) and a retail RO. They are not going to write "just replace plugs because we were in there", that could cause a real sh.. storm, meaning the mechanic didn't get paid one dime and the service dept made nothing either for the extra work.
No dealer I know will do "just replace it while you are in there" job, it can lead to problems. $300 for plugs on that engine is not bad, some of the late model Subaru engines can be a real PITA to do plugs in.
That actually explains it very well, thank you. Never had a vehicle in for such major repair before, so I was probably being a little naive.