Rzoil RZ400 10W40 is a premium HC synthesis engine oil designed for passenger cars and light commercial vehicles. It provides exceptional protection against wear, corrosion, oxidation, piston deposits, and sludge. Compatible with modern multi-cylinder, turbocharged, and compressor engines, it complies with ACEA A3/B4, API SN/CF, and manufacturer specifications including MB 229.1 and VW 501 01/505 00. Its superior thermal stability and shear resistance ensure reliable year-round performance, preventing cylinder and valve deposits while maintaining a stable lubricating film under demanding conditions.