WEBLUBE fully-synthetic ester 5W-40 is recommended in very high performance cars powered by gasoline or diesel, naturally aspirated or turbocharged multi- valve injection engines. Tuned engines operating on a wide range of engine speeds and temperatures, in the most severe driving conditions. Engines producing medium dilution into the oil. The fully-synthetic Esters 5W-40 grade of WEBLUBE 5W40 allows excellent oil flow into the engine, fastest oil pressure from cold and fast progression through the rev range.