Mercury Marine Premixed 50/50 Extended Life Coolant Antifreeze Mercury Marine Extended Life Coolant Antifreeze utilizes an improved formula that will not cause gelling, protects to -34°F, and is immediately ready for use upon opening. It provides 5 year / 1000 hour protection to your engine and warranty protection for all Mercury MerCruiser gasoline engines with closed cooling systems.Brand: MercuryCategory: > Engine Room > Winterizing Mercury® Diesel 3 (150-270hp) | Mercury Marine Mercury Diesel’s 3 engine simplifies maintenance by locating service points at the front of the engine. The oil, coolant, fuse box, seawater strainer, drive lube (sterndrive only) and power steering fluid (sterndrive only) service points are located at the front of the engine next to Mercury’s color-coded maintenance schedule to provide Antifreeze | Engine Coolant | Halfords Antifreeze is essential to keeping your car running smoothly during the winter months. Antifreeze lowers the freezing point of the water in your car's engine cooling system, preventing the water from freezing when the mercury drops. If the water is allowed to freeze, it could damage your engine once it's heated up, resulting in costly repairs. Mercury Diesel | Mercury Marine Mercury Diesel. Mercury Diesel engines offer a sophisticated diesel-engine experience: Advanced turbocharging and injection technologies produce a powerband that’s carefully calibrated for marine performance and outstanding economy.