Luber-Finer extended-service coolant filters are designed to protect cooling systems for up to 1 year, 150,000 miles, or 4,000 hours, the company says. They can be used with conventional coolant, ethylene, or propylene glycol. Filters have specially formulated synthetic media. Additionally, filters are precharged with a controlled-release supplemental coolant additive to protect engines against corrosion, cavitation and scale.