​TKD dirty identification type cold air filter to solve the problem between the owner and the depot[When should I change the air filter!?As long as it is identified by the naked eye, it is determined according to the change of the dirty identification area, and it is not wasted if it is dirty!Little knowledge: The replacement cycle of the air filter, the driving conditions and the environment will determine the frequency at which the air filter needs to be replaced.The dirt road, dusty areas and urban areas stop and go, the traffic environment shortens the service life of the air filter.