Wesfil Air Filter WA5238 Ultra-Rotor They should be changed whenever

They should be changed whenever the pads are replaced or when the vehicle's warning light indicates

Anti drain-back valve preventing oil draining back out of the filter through the inlet holes

Stable co-efficient of friction

The stop light switch is used to interrupt the cruise control circuit and disengage the cruise control when the brake pedal is applied

Wesfil Air Filter WA5238 Ultra-Rotor They should be changed wheneverThe extensive range of Wesfil air filters are a direct result of a wealth of technical and manufacturing expertise. Air filters play a huge role in maximizing engine efficiency and fuel economy. Continual research and development has led to a range of features designed to optimize vehicle performance.