Shell Oil 9404006021 DEX-COOL Extended Life Antifreeze Coolant Concentrate 1 Gallon

Shell DEX-COOL Extended Life Antifreeze/Coolant Concentrate is a single-phase, ethylene glycol-based universal engine coolant formulated with a unique extended life carboxylate inhibitor system. This advanced coolant technology provides superior protection against corrosion, cavitation, and scale buildup in modern gasoline and diesel engines.

Key Features:

• Extended service life of up to 400,000 miles or 8,000 hours in heavy-duty applications
• Carboxylate inhibitor technology provides long-lasting corrosion protection
• Universal formulation compatible with a wide range of engine types and metals
• Nitrite-free formula ideal for applications where nitrite is not required
• Concentrated formula requires mixing with water before use (typically 50/50 ratio)
• Meets or exceeds major OEM specifications for extended life coolants

This concentrate must be diluted with distilled or deionized water according to manufacturer recommendations before use. Proper dilution ensures optimal freeze protection, boil-over protection, and corrosion inhibition. Sold in case quantities of 6 gallons for fleet and professional use.