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It could also just be a sloppy breakdown of the charges. Eg. Your total major service bill was the $500 you agreed on. The software or admin person may have just done a lazy split.
Dealers go by KSD. Your independent shop can have access to a book which also publishes these estimates. Repco also provides this info on subscription basis.
Since they changed the air filter, did they sting you for another set of plugs at the same time? That happens too. Even in shops equipped to scan the keys.
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