BLACK DIAMOND 22-084-07 PISTON RING FOR 07-15 BMW N54B30 3.0L 335i 535xi 740i X6 Z4 L6 DOHC

C.T.I. BLACK DIAMOND 22-084-07 PISTON RING FOR BMW 08-15  3.0T L6 E90 335i 740Li X6 Z4 E92 E93 N54B30A DLC (Black Diamond) stands for Diamond-like Carbon coating on the piston rings. Providing lower fuel consumption, C.T.I.'s DLC ring has the advantage of high hardness, low friction which can increase wear resistance, reduce wear rate, decrease internal stress and extend life of piston rings. Hardness(Hv0.05) >2800 Friction Coefficient <0.04 Condition: 100% New  Brand: C.T.I.Surface: Diamond Like Carbon Plating Engine Type: N54B30A, N55B30A Compatible Model: Z4, 135i, 740Li, 335i, X6, 535i, 335xi, 435i, 640i, 640xDrive ISO-9001/IATF-16949 Approved Manufactured quality meets or exceeds OEM specifications. Please refer to the images for an accurate description of the parts included in this listing. PRODUCT SPECIFICATIONS: STD Piston Ring Size(mm) 1st ring:   84*1.5*3.1mm 2nd ring:  84*1.5*3.3mm Oil Ring:  84*2.5*2.8mm Package Contents 1 C.T.I. Blac