This listing is for a set of 6 piston rings designed for B58B30 and B58B30A engines with a standard cylinder bore of 82.00mm.These rings are intended for 3.0L turbocharged applications. Package Includes: 6 Piston Rings Compatible With: 340i Base 3.0L (2016–2018) 340i GT xDrive Base 3.0L (2017–2019) 340i 3.0L (2016) 340i M 3.0L (2016–2018) 340i Sport 3.0L (2016) 340i xDrive Base 3.0L (2016–2018) 440i Base 3.0L (2017–2019) 440i Gran 3.0L (2017) 440i Gran Coupe Base 3.0L (2017–2019) 440i Gran Coupe M 3.0L (2018–2019) 440i M 3.0L (2017–2019) 440i xDrive Base 3.0L (2017–2019) 440i xDrive Gran Coupe Base 3.0L (2017–2019) 540i Base 3.0L (2017–2020) 540i M 3.0L (2018–2020) 540i xDrive Base 3.0L (2017–2020) 640i xDrive Gran Turismo Base 3.0L (2018–2019) 740i Base 3.0L (2016–2019) 740i Excellence 3.0L (2016–2019) 740i xDrive Base 3.0L (2017–2019) M140i Base 3.0L (2017–2019) M240i Base 3.0L (2017–2020) M240i Convertible 3.0L (2020) M240i Coupe 3.0L (2020) M240i M 3.0L (2018) M240i Sport 3.0L (2017–2019) M240i xDrive Base 3.0L (2017–2020) X3 M40i 3.0L (2018–2019) X4 M40i 3.0L (2019) Specifications: Engine Code: B58B30 / B58B30A Engine Type: 3.0L (2998cc) Turbocharged Cylinder Bore Diameter (STD): 82.00mm Set Quantity: 6 Piston Rings Material: Cast Iron / Steel (varies by ring component) Installation Information: cylinder bores are clean and within tolerance.Lubricate piston rings with engine oil before installation.Install each piston and ring into its corresponding cylinder, observing correct ring orientation and staggering of ring gaps.Apply even pressure to compress rings during piston insertion.Repeat for all cylinders.