Could it just be they spilled oil when they did change it and only now because of the driveway angle it's showing up. Either way have them check the leak out, determine the cause if any and if you want them to change the oil be perpared to fork over @$130 as they simply won't do it outside of the maintenace plans paramters IE every 15K OR once a year if you put less than 15K on the car. Mine goes in Tuesday for it's first scheduled maintenance visit and it'll have less than 14K so we'll see if they reset the OBC.
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