What is so special about the WF2121 filter that it can go 150,000 miles or one year?
This filter contains StrataPore™ synthetic media that is bonded to two layers of coated screen cloth. This process ensures that the media will still be doing its job after such a long period. Conventional paper media is pushing the life envelope if taken to 50,000 miles. Additionally, the filter shell is made of thicker steel with a special coating to resist corrosion. The ES additive contained within the filter is in the form of small pellets that are coated to retard their dissolving. The coating is water permeable but not coolant soluble (it does not dissolve). When moisture permeates the pellet coating, it wets the pellet causing expansion. This cracks the coating shell and the ES SCA begins dissolving into the coolant. This prolongs the addition of additional SCA into the coolant over a period of many months.
