Product comments Life-of-the-engine, 1,000,000-mile coolant. Provides antifreeze and anti-boil protection superior liner pitting and corrosion protection superior aluminum and solder protection compatible with gaskets, elastomers and other non-metallics in the engineOptimizes cooling system performance and water pump life contains proprietary scale inhibitors. Compatible with all other antifreeze/coolants available in concentrate, 50/50 and 60/40For all heavy-duty diesel and gas engine additive levels are easily maintained via DCA4 liquid or DCA4 chemical filters. Ensure proper additive levels and coolant pH through coolant testing and the addition of SCAs or new coolant if necessary. Testing your coolant every 150,000 miles or 4,000 hours is recommended to identify system contamination and to screen for engine problems.