BMW 3.0 Straight Six Engine – The Beauty of the B58 and S58 Beast

Zooming in on the award winning engine

First of BMW as an automotive brand is synonymous with great handling dynamics, rear wheel drive and “sheer driving pleasure and that is purely credited to the chasis characteristics and brilliant drivetrain. The combination of these essential ingredients gives us the ultimate driving machine, as the slogan says. Once more, the Bavarian automaker is known for their straight six cylinder engines in both petrol and diesel fuel types and that lands me straight to the point of this piece; The B58 and S58 3.0 straight six engines. Generally, the use of a straight six layout is quite simple and that is to achieve mechanical engine balance, resulting in much less vibration than engines with fewer cylinders such as three cylinder engines, that need a balancing shaft to counteract the twisting force as the engine would be trying to naturally rotate and flip over on itself. So the straight six engines have that balance and are smooth runners, great!

Straight 6 Cylinder engine with firing order 1-5-3-6-2-4 – Illustration by Michael Frey


Introducing the BMW B58 engine.

The BMW B58 is a twin-scroll turbocharged straight-six cylinder engine that features a direct fuel injection, variable valve timing and variable valve lift. This engine runs a 2,998 capacity with each cylinder bored to a 500 cc 0.5 x 6 = 3.0, I did math you know. Depending on application on the maker’s vast model lineup, this engine has outputs ranging from 240kW and 447N.m of torque to 285kW and 500N.m of torque.

Which models use this engine?

This versatile engine begun production in 2015 as a successor to the N55 engine and has since been installed in numerous models. Let’s go through the models using this engine by their power output tunes.

• 240kW

This engine runs in the G11/G12 740i/Li, F32/F33/F36 440i and the previous generation F30/F31/F34 340i.

BMW 340i F30

• 250kW

10 more kilowatts and we have an engine that propels the 1-Series F20/F21 M140i, 2-Series F22/23 M240i, X5 xDrive40i/sDrive40i, X7 xDrive40i, 5-Series 540i, 6-Series 640i, X6 xDrive40i, 7-Series 740i, 8-Series 840i. This is the same engine that does duty in the 2019 Toyota Supra 3.0 & Z4 M40 (in countries that are subject to EU emissions standards) as well as the Morgan Plus Six retro-styled two-door two-seat roadster.

• 265 kW

This version is fitted in the X3 M40i, X4 M40i, 3-Series 340i, the 4-Series 440i and the 5-Series 540i.

• 285 kW

The New Z4 M40i & the 2020 Toyota Supra (in countries that are not subject to EU emissions standards) use this engine alongside the G20 M340i, G01 X3 M40i and the G02 X4 M40i.

BMW G20 M340i

The S58 high performance engine

The S58 engine is basically a high performance version of the B58 engine, which was released in 2019 equipped with two turbochargers, high-pressure injection and Valvetronic, tuned to 353kW. The first cars to benefit from this engine are first ever F97 X3 / F98 X4 M SAV twins. As if that is not enough power, boom a Competition package that takes the power to 375 kW, 600 Nm of torque for even more performance! Both these engines will definitely perform duty in the upcoming M3 sedan and M4 coupe.

BMW F97 X3 M and F98 X4 M

This twin-turbo beast is fielded to take on the likes of Audi’s RS5 Quattro, Mercedes-AMG C63’s rumbling V8 Twin-Turbo and the feisty Alfa Romeo Giulia Quadrifoglio’s rhapsodic twin-turbo 2.9 V6. Serious competition but this 3.0 mill stakes its claim very well and it’s a strong motor that thrusts the cars with fierce energy.

BMW’s S58 Drivetrain

Thanks to Wikipedia and BMW South Africa

Absolut Sabs

I am just a car enthusiast who loves cars, enjoys motoring content and spends most time drooling over cars I can't afford. Take me to a Motorshow and we're friends for life.

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