Coolant Filter Kit is a bypass-style system that filters a small amount of the coolant on each pass. By using a spin on filter we make it easy for you to change your coolant filter at regular intervals. These filters will remove all solid particles. Install a coolant filter in order to extend the longevity of your cooling system components & oil cooler. Typically you will use 3 filters in the first 9 months. Once the initial 9 months has passed you will only need to change the filter once a year.