All Pencool 3000 Cooling System Filters combine a high-quality, long-life Pencool Filter with one pint or more of Pencool 3000 Cooling System Corrosion Inhibitor and Coolant Stabilizer. It's the only high performance filter that can stop coolant gel formation. Pencool 3000 is accepted for use by major engine manufacturers and is compatible with all types of antifreezes. All NF3000 version filters fit standard filter brackets for Detroit Diesel, Caterpillar, Cummins, Ford, and other engines.