4.6L Twin Screw guys... Oil question

Tifosi2003GT

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Sorry to do this but.. I've used the search button and something is bothering me this year as I'm ready to change oil on my 03

I've always run Amsoil Signature Series 10w-30 w/ Ford racing FL-820

How many of you guys run 5w-30 vs 10w-30?
 

Rambro

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I just switched to Amsoil 0w40 and it really made the engine much quieter.
 

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