Did you know that:
– A new DPF will run for approximately 300-1000 miles before it first regenerates? But after then, it should happen around every 200 miles if the operating conditions require it, and the vehicle is functioning correctly.
– If a DPF is more than 80% blocked within 200 miles, there is almost certainly a problem with another part of the emissions system that caused the filter to originally block and no longer function correctly.
– A new DPF is not a flow through device like a catalytic converter. Exhaust gases pass into the filter and the gases must be able to flow through the internal cell walls in order to exit the filter. The DPF cell walls are porous to allow the gases through and are designed to trap any particulate matter (soot). This matter ends up deposited on the cell walls.
– If the vehicle is parked before regeneration has been completed and this process is repeated over a period of time, the soot deposits built up can reach a level where regeneration is no longer sufficient to clear the blocked filter. The resulting back pressure will cause poor vehicle performance or breakdown.