Ford Mustang Forum - View Single Post - 2013 Mustang GT - Tapping/Knock Nose Ford Refuses Fix
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post #15 of (permalink) Old 03-19-2016
stevo3176
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So i tried changing the oil to 5w-30 and guess what it worked. I was shocked. What really surprised me was how smooth over all the motor ran. I could tell the moment the engine started running after the oil change that something was different. I am surprised they recommend 5w-50 at all it made the car sound terrible.

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