Castrol Heavy Duty 30 Motor Oil is a monograde oil engineered for greater protection against thermal breakdown. Product Features:Heavy-duty formula provides maximum engine wear protection in warm climates; designed for use in temperatures above 40FContains dispersants, antioxidants, detergents and varnish inhibitors that help prevent ring-sticking and build up of harmful engine depositsEngineered for greater protection against thermal breakdownExceeds all passenger car and light-truck manufacturers' warranty requirements for the protection of gasoline and turbocharged engines where API SM, SL, SJ or SH is recommendedMade in the USA
