King MB5784SI0.5 +0.50mm SI Main Bearings BMW N52 N53 N55 3.0L I6 328i 335i 535i

Vehicle Fitment

• 2008-2013 BMW 128i (E82/E88, Base, Convertible, RWD, 3.0L I6 N52B30A)
• 2008-2013 BMW 135i / 135is (E82/E88, Base, Convertible, RWD, 3.0L Turbo I6 N54B30A/N55B30A)
• 2011 BMW 1 Series M Coupe (E82, Base, RWD, 3.0L Turbo I6 N54B30A)
• 2006 BMW 325i / 325xi (E90/E91, Base, RWD/AWD, 3.0L I6 N52B30A)
• 2007-2013 BMW 328i / 328i xDrive / 328xi (E90/E91/E92/E93, Base, RWD/AWD, 3.0L I6 N52B30A)
• 2001-2006 BMW 330Ci / 330i / 330xi (E46, Base, RWD/AWD, 3.0L I6 N52B30A)
• 2007-2015 BMW 335i / 335i xDrive / 335xi / 335is (E90/E91/E92/E93/F30, Base, RWD/AWD, 3.0L Turbo I6 N54B30A/N55B30A)
• 2014-2016 BMW 335i GT xDrive (F34, Base, AWD, 3.0L Turbo I6 N55B30A)
• 2014-2016 BMW 435i / 435i Gran Coupe / 435i xDrive / 435i xDrive Gran Coupe (F32/F36/F33, Base, RWD/AWD, 3.0L Turbo I6 N55B30A)
• 2006-2007 BMW 525i / 525xi (E60/E61, Base, RWD/AWD, 3.0L I6 N52B30A)
• 2008-2011 BMW 528i / 528i xDrive / 528xi (E60, Base, RWD/AWD, 3.0L I6 N52B30A)
• 2001-2007 BMW 530i / 530xi (E60/E61, Base, RWD/AWD, 3.0L I6 N52B30A)
• 2008-2016 BMW 535i / 535i xDrive / 535xi (E60/F10/F11, Base, RWD/AWD, 3.0L Turbo I6 N54B30A/N55B30A)
• 2014-2016 BMW 535i GT xDrive (F07, Base, AWD, 3.0L Turbo I6 N55B30A)
• 2013-2016 BMW 640i / 640i xDrive / 640i Gran Coupe (F12/F13/F06, Base, RWD/AWD, 3.0L Turbo I6 N55B30A)
• 2013-2016 BMW 740i / 740Li (F01/F02, Base, RWD, 3.0L Turbo I6 N55B30A)
• 2007-2010 BMW X5 xDrive30i / X5 3.0si (E70, Base, AWD, 3.0L I6 N52B30A)
• 2011-2013 BMW X5 xDrive35i (E70, Base, AWD, 3.0L Turbo I6 N55B30A)
• 2004-2010 BMW X3 2.5i / X3 3.0i / X3 xDrive30i (E83, Base, AWD, 3.0L I6 N52B30A)
• 2011-2017 BMW X3 xDrive28i / xDrive35i (F25, Base, AWD, 3.0L Turbo I6 N55B30A)
• 2012-2015 BMW X1 xDrive35i (E84, Base, AWD, 3.0L Turbo I6 N55B30A)
• 2008-2014 BMW X6 xDrive35i / 35iX (E71, Base, AWD, 3.0L Turbo I6 N54B30A/N55B30A)
• 2010-2011 BMW Z4 sDrive35i / sDrive35is (E89, Base, RWD, 3.0L Turbo I6 N54B30A/N55B30A)

Fitment Notes

• Fits BMW N52B30A (naturally aspirated), N53B30A (direct injection NA), and N55B30A (single Twin-scroll Turbo) 3.0L inline-6 engines sharing the same main journal diameter - confirm engine code before ordering
• This is a +0.50mm undersize set - for use on crankshafts ground 0.50mm under standard main journal diameter; always measure journals with a precision micrometer before ordering
• SI Series = bi-metal aluminum silicon construction with 2.5-3% silicon; ideal OE-replacement grade for stock and mild performance street rebuilds
• Does not fit the N54B30A (twin-turbo) or N20B20 - verify engine code; N54 uses the same MB5784 part number base but verify fitment separately
• Available in STD, +0.25mm, +0.50mm, and +0.75mm undersizes under separate part numbers

Features

• SI Series bi-metal aluminum silicon construction with 2.5-3% silicon for enhanced strength and wear resistance on BMW's forged steel crankshafts
• Improved crankshaft finish characteristics reduce microscopic ferrite peaks on reconditioned journal surfaces for better oil film stability
• Enhanced oil clearance over OE specification reduces wear and extends crankshaft service life
• Lead-free construction meets current environmental compliance standards
• Full 7-pair set covers all main crankshaft journals in the inline-6 engine
• Tight wall thickness tolerances ensure consistent oil clearance across all 7 main journals
• Suitable for OE replacement and street rebuild applications across all N52/N53/N55 3.0L variants
• Manufactured under IATF 16949 and SAE AS 9100 certified quality control

Specifications

• Part Number: MB5784SI0.5
• Undersize: +0.50mm (0.020")
• Series: SI (Bi-Metal Aluminum Silicon - OE Replacement)
• Engine: BMW N52B30A / N53B30A / N55B30A 3.0L Inline-6 (DOHC, 24-Valve)
• Position: Crankshaft Main (Upper and Lower shells)
• Quantity: 7 pairs (14 shells total - full I6 main bearing set)
• Available Sizes: STD / +0.25mm / +0.50mm / +0.75mm

Included Components

• 7x Upper Main Bearing Shells
• 7x Lower Main Bearing Shells

Product Description

The King MB5784SI0.5 is a +0.50mm undersize crankshaft main bearing set engineered for the BMW N52B30A, N53B30A, and N55B30A 3.0L inline-6 engines - a platform covering a wide range of BMW 1 Series, 3 Series, 4 Series, 5 Series, 6 Series, 7 Series, X1, X3, X5, X6, and Z4 models from 2001 through 2016. The SI Series uses King's proven bi-metal aluminum silicon structure with 2.5-3% silicon content, delivering reliable OE-replacement durability for street rebuilds on naturally aspirated, direct injection, and turbocharged variants of BMW's iconic 3.0L inline-6.

This +0.50mm undersize set is for crankshafts ground 0.50mm under standard main journal diameter. Always verify the specific BMW engine code and measure crankshaft main journal diameters with a precision micrometer before ordering. The full 7-pair set covers all main bearing positions in the inline-6 engine. For crankshafts at factory diameter, the standard MB5784SI is the correct choice; the +0.25mm and +0.75mm variants are available under separate part numbers for other machining specifications.