Prime® Conventional Green 50/50 is an ethylene glycol-based product for use in car and light duty trucks that are already using a conventional coolant. The inhibitors prevent rust, corrosion, and provide freezeup and boil-over protection. Prime Green 50/50 can be used to top-off cooling systems in vehicles using conventional AF/C, will not harm rubber parts, and meets ASTM D3306 and D4985 standards.