Assess Filter Weight and Resistance
Weigh and compare the old filter with a new one: a clogged filter may weigh 15%-30% more due to trapped impurities. If the tightening torque exceeds the normal range (e.g., >20N·m) when installing a new filter, residual debris from the old filter might cause increased resistance.

Monitor Engine Operation
A clogged filter leads to poor engine lubrication, manifested by:

Use Specialized Tools