Brian,
What PowerService Product do you use?
Diesel Kleen, Cetane Boost or both?
In the past, I have used Lubro Moly's Diesel Purge ala DieselGiant's method
of running on straight Purge to clean the system.
Diesel Purge Mercedes diesel maintenance tips


Jeff

__________________
1984 300SD 300,000 miles--two tank WVO setup
2.88 diff & 500SEL anti-squat rear end