PETRONAS Tutela Coolant LL-Si is a premium performance concentrated Long-Life Coolant delivering optimized performance and component durability for vehicle cooling systems. Formulated with Mono-Ethylene Glycol enhanced with a special Silicate Organic Acid inhibitor (Si-OAT Technology), free of nitrites, borates, phosphates and amines, it provides excellent protection against overheating, frost and corrosion, especially for cooling systems that contain innovative light alloy materials.