Optima D4, blended from hydro-treated base stocks and a advanced additive package, is the premium grade diesel
engine oil designed to exceed the lubrication requirements of the most modern diesel engines. It provides excellent
protection for high performance diesel engines.
Extensive field-testing proves that Optima D4 Diesel Engine Oil will minimize carbon deposits, which interfere operation
efficiency in the piston ring zone. This reduced carbon build-up means less ring wear and cylinder bore polishing. The benefits of
using Optima D4 Diesel Engine Oil are less oil consumption, less ring breakage and less piston skirt scuffing. The acid
neutralizing additives in Optima D4 Diesel Engine Oil will also reduce corrosion wear, even when using diesel fuel with relatively
higher sulfur content.