King Engine Bearings For Toyota Supra B58 Main Bearing Set - Size STDX

Vehicle Fitment

• 2020-2026 Toyota GR Supra (Base, Premium, 3.0, A91, A91-CF, RWD, 3.0L Turbo I6 B58B30)
• 2019-2026 BMW Z4 (sDrive30i, M40i, G29, RWD, 3.0L Turbo I6 B58B30)
• 2016-2026 BMW 340i / 340i xDrive (F30/F31/F34, Base, RWD/AWD, 3.0L Turbo I6 B58B30)
• 2017-2026 BMW 440i / 440i Gran Coupe / 440i xDrive (F32/F36/F33, Base, RWD/AWD, 3.0L Turbo I6 B58B30)
• 2017-2026 BMW 540i / 540i xDrive (G30/G31, Base, RWD/AWD, 3.0L Turbo I6 B58B30)
• 2017-2026 BMW 640i Gran Turismo xDrive (G32, Base, AWD, 3.0L Turbo I6 B58B30)
• 2016-2026 BMW 740i / 740i xDrive / 740Li (G11/G12, Base, RWD/AWD, 3.0L Turbo I6 B58B30)
• 2018-2026 BMW X3 xDrive30i / M40i (G01, Base, AWD, 3.0L Turbo I6 B58B30)
• 2019-2026 BMW X4 xDrive30i / M40i (G02, Base, AWD, 3.0L Turbo I6 B58B30)
• 2019-2026 BMW X5 xDrive40i / M50i (G05, Base, AWD, 3.0L Turbo I6 B58B30)
• 2020-2026 BMW X6 xDrive40i / M50i (G06, Base, AWD, 3.0L Turbo I6 B58B30)
• 2018-2026 BMW M240i / M240i xDrive (F22/F23/G42, Base, RWD/AWD, 3.0L Turbo I6 B58B30)
• 2022-2026 BMW M440i / M440i xDrive (G22/G26, Base, RWD/AWD, 3.0L Turbo I6 B58B30)

Fitment Notes

• Fits BMW B58B30 3.0L Twin-Scroll Turbo inline-6 engine and Toyota GR Supra B58 variant sharing the same main journal diameter - confirm engine code before ordering
• STDX size - shells are 0.0005" thinner per side (0.001" total) than standard (STD), providing 0.001" of additional total oil clearance on a standard-diameter crankshaft without grinding; consult your engine builder before selecting this size
• MC Series = bi-metal aluminum base structure with K-340 nano-composite polymer coating; lead-free, optimized for start-stop, cold-start, and turbocharged applications requiring metal-to-metal contact protection
• pMaxKote coating adds no additional wall thickness - original precision oil clearance is maintained, with STDX providing the extra 0.001" clearance as intended
• Available in STD, STDX, .026mm, +0.25mm, and +0.50mm sizes under separate part numbers
• Does not fit the N54, N55, or S55 inline-6 engines - B58 is a separate engine platform; verify VIN/engine code before ordering

Features

• MC Series bi-metal aluminum structure with K-340 nano-composite polymer coating for excellent anti-friction and wear resistance during start-stop and cold-start cycles
• Polymer coating protects against metal-to-metal contact during oil starvation events - ideal for modern turbocharged BMW and Toyota B58 applications
• STDX extra clearance eliminates the need to trial-fit multiple bearing sizes - a single set delivers 0.001" more clearance than STD on a standard-diameter crankshaft
• 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
• Manufactured under IATF 16949 and SAE AS 9100 certified quality control

Specifications

• Part Number: MB7779MCSTDX
• Size: STDX (Standard with 0.001" / 0.025mm Extra Oil Clearance)
• Series: MC (Bi-Metal Aluminum + K-340 Nano-Composite Polymer Coating - OE Replacement)
• Engine: BMW B58B30 3.0L Turbo Inline-6 / Toyota GR Supra B58 3.0L Turbo I6
• Additional Clearance vs. STD: 0.001" (0.025mm) total
• Position: Crankshaft Main (Upper and Lower shells)
• Quantity: 7 pairs (14 shells total - full I6 main bearing set)
• Available Sizes: STD / STDX / .026mm / +0.25mm / +0.50mm

Included Components

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

Product Description

The King MB7779MCSTDX is the STDX-size MC Series crankshaft main bearing set engineered for the BMW B58B30 3.0L Twin-Scroll Turbo inline-6 and the Toyota GR Supra B58 variant - covering a wide range of BMW 2 Series, 3 Series, 4 Series, 5 Series, 6 Series, 7 Series, X3, X4, X5, X6, Z4, and the Toyota GR Supra from 2016 onward. The MC Series uses a bi-metal aluminum structure with King's K-340 nano-composite polymer coating, applied at the factory with no added wall thickness, delivering outstanding seizure and wear resistance under the start-stop and turbocharged operating conditions typical of modern B58 applications.

The STDX size designation means each shell is produced 0.0005" thinner per side than standard, providing 0.001" of additional total oil clearance on a factory-diameter crankshaft without grinding. This makes the STDX the preferred choice for builders targeting slightly looser-than-stock clearances on unground crankshafts - a common strategy on high-output B58 builds. The full 7-pair set covers all main bearing positions in the inline-6. Always consult your engine builder to confirm the correct size for your specific clearance target before ordering.