If you plan on getting it checked out you are better off getting one of the specialist workshops to do it,( eg:STechnic,MMS,RMS etc) as they would have a better understanding of what areas that need to be checked for that particular vehicle and that mileage. They can't tell you if it's missed a service, but they can tell if it's been well looked after or "prettied up" for a sale, & what work may be required in the near future.

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The older you get the more you realise that no one has a clue. Every one is just winging it.
MY05 STI