If they blend it with the diesel (in house) just ask them if they have B2 hopefully they have an extra cetane blend and you fill up and drive off and enjoy. It does give more power. It will take about 1/2 tank before you will notice it. Ford says NOT to go over 5% or B5 blend in the 6.0 don't know for sure why but there must be some reason. There is a service bulletin out on it but I haven't seen it just was told about it by service dept.