just an fyi, Z doesnt like old oil. I put 6k on some 5w20 RP, kind of a trial by error test if you will, the engine noise was starting to get ridiculous, changed it out with 5qts of RP 5w30, now she purrs like a kitten, its incredible how much a difference fresh oil makes.
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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs
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