6PCS Pistons & Rings Set 10.7:1 For E90 E60 E83 128i 328i 528i X1 N52 3.0L 11257558528 11257536373 11257561848 11257547838 Piston and ring set designed for 3.0L L6 engines with a compression ratio of 10.7:1. Bore diameter measures 85.00mm. Wrist pin diameter is 20mm with a wrist length of 49mm. Ring thickness specifications are 1.2mm for the first ring, 1.5mm for the second ring, and 2.0mm for the third ring. Compatible with engine model N52B30 3.0L L6 (2996cc) naturally aspirated. Fits applications including E90, E60, E83, E84, E85, E86, E88, E89, E91, E92, E93, F10, F11, F25, and related chassis codes. Includes OE/OEM reference numbers 11257558528, 11257536373, 11257561848, 11257547838. Set includes 6 pieces. Compatibility Disclaimer: This is an aftermarket replacement part. Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.