been running 75% WMO to 25% bio.never had a problem.Yea it smokes like crazy at idle.the longer you let it idle the more it will smoke.When it starts cooling down in the mornings like this time of year i will start mixing it more 50/50.Yea it may or may not be good but with fuel being the price it is,wmo is free 
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03 f-250 6.0 custom tunes sct
2 trips to the dealer ship to fix the same problem
got tired of wasted trips
fixed it my self ARP headstuds, EGR blockoff plate and guess what (no more problem !!!)
all work done by me
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