Engol Premium Diesel Oil 15 W40 Ci 4 Plus Is An Advanced High Performance Sae 15 W40 Diesel Multigrade Engine Oil Designed To Meet And Exceed The Highest Practical Performance Level Requirements Of Engines Under Extreme Conditions. It Ensures Excellent Control Over Soot Induced Wear, High Temperature Piston Deposits, Corrosion And Foaming. It Provides Excellent Resistance To Bore Polishing, A High Level Of Wear Protection And Ensures Superior Engine Cleanliness At Extended Drain Intervals.