What kind of oil should I use?

278102 Views 223 Replies 84 Participants Last post by  AllFordsGuy
I know that the owners manual says use 5W20 but I'm not sure what to use. The only thing I do know is that I'm goin to use Mobil 1 synthetic. Should I use the recommened 5W20 or should I use a 5W30 or a 10W30?
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I have always used royal purple oil in every vehicle I have ever owned. As well as in every engine I have ever built for customers at my old place of employment. I recomend Royal Purple Synthetic to everyone.
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