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Native Tex,
I get the impression that as of January 1, the fuel will change at the pump to the 15ppm sulfer content. The new trucks require it, and the old ones run on it.
Chatted with the Ford Service Manager yesterday when making my appt - he said it should be no problem with the 6.0, but the 7.3 is going to suffer in performance and mileage a little. Sometimes they are self made experts - but the most reliable at the time.
He also told me to watch out for the Bio-Diesel and only run 20% at a time in the tank. (not that I use it) They were having filter problems with the local fleet trucks here.
Brad
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