Mystik JT-8 Super Heavy Duty Engine Oils are value-added balanced premium additive system and premium base stocks that give outstanding deposit control,synthetic blend lubricants with a carefully balanced premium additive system and premium base stocks that give outstanding deposit control, minimize sludge and varnish, and control wear under the most severe service conditions. Formulated to provide the superior soot-handling and wear protection demanded by modern heavy duty diesel engines, they will help maintain long-term low emission performance. Mystik JT-8 Super Heavy Duty Engine Oils are available in multi-viscosity grades that offer superior high temperature protection along with easier starting and rapid oil flow in cold weather.