V.I. Plus NG 15W40 is a high-performance engine oil designed for 4-cycle and select 2-cycle stationary engines using natural or synthetic gas. It features a low ash formulation and is made from high viscosity index hydroprocessed group II base oils, combined with an exclusive anti-oxidation and anti-nitration package, as well as Frontiers’ “ETX” extender additive. This oil meets API CD performance standards and is compatible with Englehard catalysts