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From my last free oil change at the stealership (4yr maintenance free), I DIY my oil change and I noticed one of the two oil drain plug was significantly tighter than the other. This is clearly an indicator that the tech either over tighten the drain plug or did not properly tighten it with a torque wrench. I mean you can start of by tighten the drain plug with your hands and once it starts to tighten then turn about a quarter to avoid tension point.
I suspect they cut corners on and tried to cover their asses. I'd strongly challenge them and give them a good fight before coughing up that kind of mullah for repair.
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