Making DMFS last longer

Like diesel particulate filters, a worn DMF may be a symptom of other mechanical issues and not the cause, because an engine that is not running evenly will create additional vibrations that the DMF must absorb. Worn/leaking fuel injectors, a clogged EGR valve, low compression, or skipped servicing, for example, may be responsible. A tired battery, or starter motor, can prevent optimum engine cranking speeds that, again, place the DMF under stress. Before replacing the DMF needlessly, look for other underlying problems. Tuning the engine to increase torque will also place the DMF outside its original design parameters and is likely to shorten its life. Pay attention to towing weights, too.

Try to maintain a smooth driving style, especially as many modern cars possess such tall gearing. Consider that the DMF will mask the ‘kangaroo hopping’ effect that older cars would display in protest against being driven in too high a gear. Do not be afraid of changing down and giving the DMF an easier time. ‘Dumping’ the clutch violently is not advisable either and slipping the clutch excessively can cause the DMF to overheat – in much the same way as a solid flywheel can overheat and warp. Bump-starting – not a good idea for many reasons – not only does it place stress on the DMF, but it also risks bending, or breaking, the clutch pressure plate straps.