Which BMWs Have The B58 Engine? The Full List, And What To Check

The B58 is BMW’s 3.0-litre single-turbo straight-six petrol engine. It arrived in 2015 to replace the N55, and it now sits in almost every six-cylinder petrol BMW below the full M cars. Below is every car that has one, by model, chassis and year, then the difference between the original B58 and the updated versions, and what to check before you buy.

Which BMWs have the B58? The full list

Years are approximate and some models were not sold in every market. The quickest way to be sure is a reg check: enter your reg here and we’ll show the exact engine and what it makes tuned.

Easy to mix up: the earlier F20 M135i and the F30 335i use the older N55, not the B58. The current four-cylinder M135i, 330i and M235i use the B48. The S58 in the M3, M4 and X3 M is a separate M engine developed from the B58.

B58 vs B58TÜ

The original B58 arrived in 2015 in the F-series cars: the 340i first, then the M140i, M240i and 440i. In 2018 BMW gave it a technical update, usually called the B58TÜ, which went into the G-series cars such as the M340i, X5 xDrive40i and Z4 M40i. The update brought higher-pressure fuel injection with a new pump and injectors, a one-piece timing chain in place of the two-part design, separate cooling circuits for the cylinder head and the block, a lighter block and forged crank, the exhaust manifold built into the head, and a petrol particulate filter.

A further update from 2022 added port injection alongside the direct injection, mainly for emissions. Every version of the B58 responds very well to a custom map.

What to check when buying

• Service history. These make big power and big heat, you want to see regular oil changes with the correct spec, not stretched “lifetime” intervals.
• Cooling. The electric water pump and thermostat are wear items; ask when they were last done and watch for any overheating.
• Charge pipe. The plastic charge pipe can crack under boost, a cheap fix and a common upgrade, especially on tuned cars.
• Oil leaks. Valve-cover and oil-filter-housing gaskets can weep with age, minor, but worth spotting.
• Carbon build-up. Direct-injection-only B58s can gather some inlet carbon over high miles; the later engines with port injection are less prone to it. Not a dealbreaker, just budget for a possible walnut-blast eventually.
• Has it been tuned? Many have, and that’s not a bad thing, but ask who did it, whether it was a proper custom map, and whether the original file was saved. A good tune adds value; a bad one hides sins.

Why it’s a tuner’s dream

This is the B58’s party trick. The bottom end is strong enough that a custom Stage 1 alone makes a big, safe jump in power and torque, and the engine happily takes far more with bolt-ons and higher-octane fuel. Almost all are paired with the ZF 8-speed auto, which loves an xHP gearbox tune to match the extra torque and sharpen the shifts (do both together and save £125).

As with everything we do, a B58 tune starts with a full health check, we only tune a healthy engine, and it’s fully reversible.

B58 engine FAQs

What is a B58 engine?

BMW’s 3.0-litre, single-turbo, straight-six petrol engine, launched in 2015 to replace the N55. It belongs to BMW’s modular engine family alongside the four-cylinder B48 petrol and the B57 diesel.

Which is the cheapest BMW with a B58?

On the used market the F20 M140i and the F30 340i are usually the most affordable way into a B58, followed by the F22 M240i and F32 440i. The G-series M340i and M440i cost more but have the updated B58TÜ.

Is the B58 reliable?

It has a strong reputation. The issues we see are mostly wear items rather than design faults: cooling parts, the plastic charge pipe and gasket oil leaks. Regular oil changes with the correct oil matter more than anything else.

Does the Toyota Supra have a BMW engine?

Yes. The 3.0-litre GR Supra (A90) uses the BMW B58, the same engine family as the M340i and Z4 M40i.

How much power does a tuned B58 make?

Up to around 420bhp on a custom Stage 1, depending on the exact car. Our B58 tuning page has the figures by model, and Check My Car shows yours from your reg.

Bought one, or about to? Check your exact car for gains and pricing, read up on M140i / M240i tuning, then book a slot or get a quote.