Use Bosch or Beru GP's. Look at them as a maintenance item, like sparkers on a gasser. I have heard to replace them every 1-2 years or even longer if so inclined. I do follow if one is out, replace them all. Even in warm weather, the GP's are energized.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D