N52 3.0 Engine Pistons Rings Set with compression ratio 10.7:1, part numbers 11257536373, 11257561848, and 11257547838.Designed for use in models including E90, E60, E83, 128i, 328i, 528i, X1, X3, X5, Z4, and 730i.The set includes piston rings engineered for precise fit and performance in N52 3.0L engine applications.