Engine Running Rough
12-22-2009, 09:53 AM
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Join Date: Dec 2009
Location: Arizona
Posts: 3
Engine Running Rough
I was wondering if there was anyone that can answer why my engine is running rough after an oil change. I used Valvoline 5W-30 Full Synthetic, only putting 4 1/2 qts in the engine and using a 1/2 qt of Marvel Mystery Oil. I am unable to determine why the engine is running rough. Was it wrong of me to add Marvel Mystery Oil to my crankcase? Thank you in advance for the answers
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Gary Ugarek
4.6L (1996-2004 Modular) Mustang
63
12-11-2015 02:01 PM