RMweb Gold Nick C Posted November 11, 2020 RMweb Gold Share Posted November 11, 2020 I've heard of similar tricks with the cheapo oil-change places - people who have deliberately made a discreet mark on the filter before taking a car in, and finding the same mark on it when they get it back (proving that the filter hasn't been changed) 3 Link to comment Share on other sites More sharing options...
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