What Are The Best G Generation BMW Engines?

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If you’re looking for the best G-generation BMW engines, you’re already in a good place. BMW’s G generation, starting in 2015, has brought some of the most refined and powerful engines to date. 

Whether you drive a G20 3 Series, a G05 X5, or even the luxury G11 7 Series, the engine under your bonnet plays a huge part in your BMW experience. So, which ones stand out? Let’s keep it real and simple. Here’s what makes the best BMW engines from the G generation.

B58 Engine: Smooth Power and Everyday Reliability

If there’s one engine that gets a lot of love, it’s the BMW B58 engine. Found in cars like the G20 340i and G29 Z4 M40i, this 3.0-litre straight-six turbocharged engine has built a solid reputation. Why? You can trust it every day because it balances strong power (around 382 hp in newer models) with smooth performance.

It’s not just about numbers. The B58 engine is known for its reliability and lower running costs compared to older turbocharged six-cylinders. Enthusiasts like its tunability; you can safely get more power without major engine work. That’s a big deal if you want to future-proof your BMW. So, whether you’re cruising daily or planning to upgrade, the B58 stays a top choice.

B47 Engine: For Efficient Diesel Fans

Diesel drivers aren’t left out either. The BMW B47 engine powers many G-generation models, like the G30 5 Series and G01 X3. This 2.0-litre four-cylinder diesel has become the go-to for those needing strong fuel economy without sacrificing too much on performance.

Owners often highlight the B47 engine's refined nature compared to older diesels. With power outputs ranging from 150 hp to over 200 hp in twin-turbo versions, it delivers enough punch while keeping emissions and fuel use low. It's ideal for long-distance UK drivers and anyone who appreciates lower running costs without sacrificing BMW quality.

S58 Engine: Track-Ready, Road-Friendly

When it comes to high-performance, the BMW S58 engine deserves its spotlight. Built as the successor to the legendary N55 and beefed up from the B58, the S58 engine powers the mighty G80 M3, G82 M4, and X3 M models.

With output ranging from 473 hp to 503 hp in the Competition variants, this 3.0-litre twin-turbo six is serious business. But what makes the BMW S58 engine special isn’t just power; it’s how usable that power is. It revs smoothly, delivers torque across the rev range, and can handle track days without fuss.

If you’re after the best engine from the G generation for sheer performance, the S58 is your pick. And yes, it’s already proven among enthusiasts and professional drivers.

S63 Engine: V8 Muscle for Big BMWs

Let’s talk about the V8 fans. The BMW S63 engine brings serious power and performance to BMW’s larger models. Found in the G30 M5, X5 M, X6 M, and even the big G07 X7 M60i, this 4.4-litre twin-turbo V8 is nothing short of a beast.

The S63 engine makes between 600 and 617 horsepower in standard form, but it’s the instant torque and deep growl that really win drivers over. BMW’s engineers have improved cooling, strength, and emissions over the years, making this engine far more refined than earlier versions. For those who love their BMW to have muscle-car energy wrapped in luxury, the S63 leads the pack.

B48 Engine: The Unsung Hero

Finally, we have the BMW B48 engine, the 2.0-litre four-cylinder petrol that powers a huge number of G generation models: from the G20 320i to the X1 and X2. It’s not flashy like the S58 or S63 but everywhere because it works so well.

With outputs ranging from 154 hp to over 300 hp in tuned versions, the B48 engine offers solid performance for daily driving, lower running costs, and fewer mechanical issues compared to older turbo-fours. If you’re after a G-generation BMW that’s efficient but still fun, the B48 is the practical hero.

A Family Business You Can Trust

Buying from specialists who know BMWs inside and out is quite important in a market flooded with random online sellers. MT Auto Parts, based in Thurnscoe, has built a strong reputation by focusing only on BMW models from 2012 onwards. We are a family that loves BMW and has dedicated our careers to ensuring everyone gets good-quality BMW parts.

Our reputation speaks for us. We carefully dismantle cars in-house, test the parts, and list them clearly so you always know what you’re getting, whether it's OEM or aftermarket. If you are looking for a group of experts you can trust for your BMW parts, what better place to go than a dedicated family-run business with which you can build a relationship? Contact us today!

FAQs

  1. Are G-generation BMW engines reliable long-term?

Yes, BMW improved reliability across the board with the G generation. Engines like the B58 and B47 are known for better cooling, stronger components, and fewer common faults compared to older models. 

  1. What’s the difference between the B58 and S58 engines?

The B58 is the standard performance 3.0l six-cylinder used in models like the 340i and Z4 M40i, delivering strong power with great daily usability. The S58 takes the B58’s design and upgrades it for M models, with twin turbos, reinforced internals, and track-level cooling systems. 

  1. Where can I get genuine used BMW engine parts in the UK?

If you’re in the UK, MT Auto Parts in Thurnscoe is a trusted source for genuine dismantled BMW parts and they deliver them very fast! MT Auto Parts offers a wide selection of used, tested BMW engines for sale—including petrol, diesel, hybrid, and electric units—ranging from everyday B48 and B58 engines to high-performance S63 and S58 BMW engines for sale, all backed by warranty and ready for fast UK-wide delivery.
Location: Birmingham, UK

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