6pcs Pistons Rings Set STD 84mm for F20 F21 F30 F10 X3 X4 X5 X6 E82 E88 N55B30 N55B30A 3.0L L6 2979cc Twinturbo 11258619196 Material: Aluminum Design and Style: Standard 0.00 spec, not requiring cylinder expansion Cylinder Bore: 84.00mm Ring Thickness: 1st ring 1.2mm, 2nd ring 1.5mm, 3rd ring 2.0mm Compatibility: N55B30 and N55B30A 3.0L L6 (2979cc) Twin turbo engines OEM Numbers: 11258619196, 11257610297, 11257610298, 11257589824, 11257587914 This piston ring set is designed for use with specific 3.0L inline-six twin turbo engines.Constructed from aluminum, the set supports engine under demanding conditions.The standard 0.00 specification allows installation without cylinder boring, maintaining bore dimensions. The set includes rings with graduated thickness to optimize compression sealing and reduce oil consumption.The 84.00mm bore size proper fitment for designated engine models.Designed for compatibility with a range of vehicle platforms, the set supports consistent and efficient engine function. Engineered to meet OEM specifications, the components support compliance with emission standards.The materials are rated to withstand operating temperatures up to 105℃, during regular and sustained engine use. ote: This is a third-party compatible part.Brand/model citations do not imply sponsorship or approval.