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Old 04-10-2012, 08:59 AM   #13
Chances50
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Join Date: Jun 2008
Location: Haskell, Ok
Posts: 1,325
Re: switching from mobil 1 to Royal Purple

With as tight as the clearances are on these motors there is a reason ford put 5/20 in them. My motor has been run on moble 1 since day one and it looked brand new inside when we pulled it apart (except for the headgasket) I'll never run anything but moble 1 in a modular motor.

Usually when you have black burnt oil built up it from lack of changing the oil.
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