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Failure mode - Cummins 6.7L ISB (Ram HD)

CCV breather filter clogging

Reliability tier: verified - verify before ordering, see /disclosure/

Symptoms

Root cause

The closed-crankcase-ventilation filter element saturates; Bostech gives ~60-67.5k-mile service intervals. Neglected, it raises crankcase pressure (leaks) and feeds oil mist into the intake/EGR path where it becomes coke.

Diagnosis

Fixes

replace the CCV filter element at the interval (~60-67.5k per vendor guidance); earlier on severe duty ()

Prevalence

common

Affected configurations (58)