Delo Extended Life Coolant/Anti-Freeze is the Chevron version of Texaco's ethylene-glycol product. It is protected with a long-term corrosion-inhibitor package that contains patented organic additives. The inhibitor system protects the six basic metal alloys found in most heat transfer systems and eliminates the need for silicates, phosphates, borates, nitrates, and amine additives. The product doesn't require precharging or recharging for 300,000 miles of on-road use (three years or 6,000 hours of off-highway use). At that interval, add Delo Extender, and the coolant charge is good for another 300,000 miles of on-road use (three years or 6,000 hours of off-highway use).