Luber-finer LFW4071 Coolant Filter Helps to protect your system against corrosion and the build-up of harmful deposits while balancing the pH of your coolant Long term benefits include investment protection, reduced fleet costs, decreased downtime, and prolonged equipment life Pre-charged with a Lubercool II Supplemental Coolant Additive that protects coolant systems from corrosion, cavitation, and scale For use with conventional coolant For recommended intervals of up to one year, 20,000 miles or 1,000 hours