mark is the fairest and most knowledgeable mechanic ever. he never tries to ""up-sell"" his customers on other repairs and, in some cases, he will actually decline to do work that does not need to be done. many times quickie lube/oil change/vehicle inspection type places will attempt to up-sell you, sometimes using scare tactics, and when you bring it to mark w/ their recommendations he will explain and/or show you why the work is not necessary.
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