thanks for the information on the new low sulfer fuels ;Jim . been using 2cycle oil and diesel service mixed together on the 6.5 and now on the 6.6 ;put in about 1/2 pint perfill . noproblems yet , 155000 on '96 6.5 and 98000 on 01 6.6 . wonder if this will be sufficent for low sulfer! Keep up the good work!