Cool-Gard II is a fully formulated summer coolant, winter antifreeze that delivers full protection from corrosion, cavitation, foaming, rust and scaling. Cool-Gard II is designed to withstand thermal oxidation and breakdown to handle higher temperature applications while providing service life up to 6 years or 6,000 * hours.   Cool-Gard™ II Pre-Mix This ready to use coolant contains 50/50 mix of fully formulated John Deere concentrate and demineralized water. The addition of coolant conditioner or supplemental coolant additive is not required. This is a fully formulated product.   Features and benefits: 6-year or 6,000-hour * service life to reduce downtime and lower operating costs.  Offers 20% longer service intervals, which translate to savings. Possesses the high thermal and oxidative stability required by engines equipped with cooled exhaust gas recirculation (EGR). Provides superior performance in all liquid-cooling system designs. Protects against corrosion and deposits, extends water pump life, and minimizes liner cavitation Contains Bitrex ® to help discourage accidental ingestion. Supports advanced engine technology. Supports higher cooling demands. Service-ready for existing equipment. Compatible with Cool-Gard™. Excellent for diesel and automotive engines 50/50 mix (50-percent demineralized water and 50-percent concentrate). Freeze protection to -34 o F (-37 o C). Fully formulated – no coolant conditioner required at initial fill.