I just used some diesel purge on a friends 300SD and it worked great. Also changed fuel filters after using the DP. (I probably should have changed filters before running the DP).The car needed new filters so it was a perfect time to perform filter change.
I have (2) questions in regard to using DP. 1)If fuel filter maintenance is due should you change fuel filters before or after running DP thru system? (2) Is it really necessary to change fuel filters when using DP if filters only have 5-7K miles on them and fuel in pre-filter looks fairly clean? I plan on using DP on my 300SDL this week-end and was not sure if I should change the filters with the low miles on them.
1985 300D (sold)
1986 300SDL 171K
1996 Ford Explorer 62K