Prestone Command Heavy Duty Extended Life Antifreeze / Coolant is intended for use and compatible with ANY heavy duty antifreeze/coolant in ANY diesel-powered commercial vehicle or stationary engine with aluminum or other engine metals. Its patented technologically advanced red formulation is TMC compliant, and based upon a concentrated blend of premium long-lasting inhibitors designed to provide up to 600,000 miles/12,000 hours of protection against temperature extremes, rust, corrosion, scale and premature water pump failure. (Requires Extender at 300,000 miles / 6,000 hours.) Provides a silicate, phosphate and borate-free formulation for long lasting inhibition and corrosion protection. Protects aluminum and all other engine metals. No dilution necessary, this 50/50 formulation is convenient for top-offs.