John Deere Cool-Gard II Concentrate Coolant 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 Concentrate Cool-Gard II concentrate requires the addition of quality water to attain the desired concentration and freeze protection level. It is highly recommended that low-mineral or distilled water be used to dilute the coolant. Using impure water can reduce the performance and life of the coolant. 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.