Package Includes: 4 Pistons and 4 Ring Sets (piston rings included for all four pistons).Compatible With 320i (F30 chassis, 2012–2016), 320i (G20 chassis, 2019 and later), 330i (F30 and G20 chassis with B48B20 engine), S (F56 chassis with B48 2.0T engine), and 320i/330i (G30 chassis with B48 2.0T engine).Compatibility is confirmed only for vehicles equipped with the B48 2.0T engine.Verification against OE number 11259468870 is recommended.Installation requires removal of the cylinder head and oil pan to access combustion chamber components.Connecting rods and pistons must be extracted from the cylinder bores.Cylinder bore diameter should be measured to confirm compliance with engine block specifications.Piston rings are installed on pistons following orientation marks and ring gap specifications specified in the vehicle manufacturer's service manual.Piston skirts and wrist pins are lubricated before insertion.Piston assemblies are installed into their respective cylinder bores using a piston ring compressor tool, correct angular orientation relative to the crankshaft.Connecting rods are secured to crankshaft journals according to the vehicle manufacturer's specified torque values.