Full explanation
DPF works by trapping soot in a wall-flow ceramic honeycomb and periodically burning it off (regeneration) at 550–650°C. Regeneration modes: passive (during high-RPM engine operation >2 h), active (ECU injects extra diesel into cylinders to heat the DPF — adds 0.5–1% fuel use), parked (requires stationary operation, 30–45 min). Ukrainian issues: (1) short-cycle work (load-unload in the field) doesn't let active regeneration complete, clogging the DPF in 800–1,500 engine hours instead of 3,000–5,000; (2) poor-quality fuel with >50 ppm sulphur cuts efficiency in half and kills the DPF catalyst. DPF replacement cartridge price for John Deere 6M/7M series USD 4,500–8,000; Case IH Magnum USD 5,500–9,500. Professional ultrasonic cleaning (Faist Enerhaus, DPF-Ukraine) USD 400–800, restoring up to ~80% of new capacity. DPF-delete (mechanical removal) is illegal.