OKAYA ULTIMAXE^速 TURBO GOLD 15W-40 API CI4 is a super premium diesel engine oil designed for superior performance in new generation BS IV / BS III vehicles and off-road diesel vehicles. This is a high performance heavy duty engine oil that extends the life of the engine while providing long drainage and fuel economy for engines operating in harsh applications. It uses carefully selected base oils and balanced additives to neutralize corrosive acids, has excellent shear stability, and achieves in-grade viscosity performance. It is also designed to provide protection on the road using exhaust gas recirculation.