Engine modifications can significantly impact maintenance requirements, including CCV filter replacement. This raises an important question: How often should you change the CCV filter on a 6.7 Cummins if the engine is modified?

Performance tuning, larger injectors, or increased boost pressure all increase cylinder pressure and blow-by. This leads to higher oil vapor output, which places greater demand on the CCV filter. Modified engines often require more frequent CCV filter changes than stock configurations.

Even mild tuning for improved fuel efficiency can affect crankcase ventilation behavior. Owners of modified engines should monitor CCV filter condition closely and consider shorter replacement intervals to prevent pressure buildup.

For stock engines, manufacturer recommendations may be sufficient under normal driving conditions. However, for modified setups, inspecting the CCV filter during oil changes is a practical approach.

Understanding how often you should change the CCV filter on a 6.7 Cummins becomes especially important when engine performance is increased beyond factory specifications.