For car enthusiasts and future collectors, the search for the perfect modern classic often leads to overlooked gems that combine performance, practicality, and a hint of nostalgia. Enter the BMW M135i and M140i — two six-cylinder hot hatches with distinct personalities and potential to become cult classics in the coming years. Millennials and Gen Z car lovers take note: these could be the ultimate weekend cars and smart investments for the future. But what makes them so special?
Over the years, the BMW 1-Series has been offered in multiple variants, including the 116i, 118i, 120i, 125i, 116d, 118d, 120d, and 123d. While these were all competent compact cars in their own right, the real game-changer arrived with the introduction of the M135i, which took the 1-Series to an entirely new level of performance.
1. The History of the BMW 1-Series, M135i, and M140i
BMW’s 1-Series first hit the market in 2004 as a premium compact car designed to rival offerings like the Audi A3 and VW Golf. However, what set the 1-Series apart was its rear-wheel-drive (RWD) layout — a rarity in the hatchback world. This gave the car a unique driving dynamic that appealed to enthusiasts who appreciated a spirited driving experience.
The 135i (2007-2010) – N54 Engine
The range topping 135i was a typical BMW in layout, offering an in-line 6 upfront with not one, but two turbos, paired to either an automatic or manual gearbox which delivered around 300 horsepower and 400 NM of torque to the rear wheels…Impressive numbers for a small hatchback in the late 2000s.
The M135i (2012-2015) – N55 Engine
Replacing the N54’s twin turbo configuration, the M135i was introduced in 2012 as the range-topping version of the second-generation F20/F21 1-Series. Under its hood was the legendary 3.0-litre N55 straight-six single turbo engine, producing 320 horsepower. With rear-wheel drive and the option of a 6-speed manual or 8-speed automatic gearbox, the M135i delivered riotous power for boy racers looking to tear up the city streets.
- 0-60 mph in 4.9 seconds (automatic)
- Engine code: N55B30T0
The M140i (2016-2019) – B58 Engine
By 2016, BMW updated the M Performance hatchback, introducing the M140i as a replacement for the M135i. The significant change came under the bonnet with the arrival of the B58 3.0-litre turbocharged straight-six engine. Producing 335 horsepower and 369 lb-ft of torque, the M140i was quicker and smoother than its predecessor.
- 0-60 mph in 4.6 seconds (automatic)
- Engine code: B58B30M0
The M140i retained the same RWD layout and manual or automatic transmission options, making it one of the last truly driver-focused hatchbacks before BMW switched to front-wheel drive for the next-generation 1-Series (F40). It might be obvious to some, but the 140i is the last rear-wheel drive hot hatch from BMW, and potentially the last with an in-line six cylinder before the world goes all-electric. We are confident that in the future, petrolheads will seek nostalgia and the crazy character of the M135i and M140i.
And then, there’s the OG grille. The world went mental when BMW revealed the new ass-shaped face, and many of us just can’t take it seriously. Again, this is the last hot hatch from BMW to retain the favoured face of BMW.
2. Pros and Cons of the N54, N55 and B58 Engines
Both the N55 and B58 engines are renowned for their performance and versatility, but each comes with its own strengths and quirks.
N54 Engine (1M Coupe, Earlier Models)
Pros:
- Twin-turbocharged setup allows for instant power delivery
- Huge aftermarket tuning potential, capable of 500+ hp with modifications
- More aggressive, mechanical feel compared to later engines
Cons:
- Prone to reliability issues, including high-pressure fuel pump (HPFP) failures
- Turbochargers can suffer from wastegate rattle and failure over time
- Higher maintenance costs due to increased complexity
N55 Engine (M135i)
Pros:
- Excellent throttle response and linear power delivery
- Proven reliability when well-maintained
- Strong aftermarket support for tuning and modifications
- More mechanical feel and classic turbo lag appeal
Cons:
- Known for potential issues with oil leaks and injector failures
- Less efficient and refined compared to the B58
- Slightly lower power output at stock levels
B58 Engine (M140i)
Pros:
- Superior power and torque figures (335 hp and 369 lb-ft)
- Smooth, refined power delivery with minimal turbo lag
- More efficient with better fuel economy
- Exceptional tuning potential — easily reaching 400-500 hp with basic upgrades
- Built with a lighter aluminium block and stronger internals such as the conrods, able to withstand greater pressures
Cons:
- More complex engine, leading to potentially higher repair costs
- Heavier than the N55, slightly impacting the driving feel for purists
Like the B52 Bomber, the 58 is revered in the petrolhead world and will be hanging in the halls of fuel injection for years…
3. Why All Could Be Future Classics
TUNEABILITY:
We’ve touched on it a bit, but the M140i and those that came before are incredibly tuneable and despite being somewhat flawed from the factory, you can turn this into a really capable road and track car. Pair uprated suspension, bigger brakes, a Limited Slip Differential and anti-roll bars with an upgraded intake, stage 1 gearbox and engine map and you’re getting closer to full fat ‘M car performance’ for a lot less.
SCARCITY:
Let us be clear, these are not rare cars – there’s around 13,000 M140is licensed in the UK today, which is just 500 more than the M2. However, in the UK, high numbers of M140is have been written off or damaged in accidents due to inexperienced drivers taking full advantage of the B58. In the next 20 years we can expect many more of these to disappear, so finding an authentic example in the future will be even more appealing.
CULTURAL SIGNIFICANCE:
Our parent’s generation grew up with Lotus Esprits and Renault 5 Turbos. For millennials born in the mid-1990s the M140i and the M135i are some of the first high-performance cars owned by this generation. In 20 years time, when we’re looking for a weekend blast of nostalgia, the 1-series will be the hot hatch that makes us feel young again.
Practicality
When we bought ours, the salesman asked my wife why we were buying one, and her response was ‘for practical performance.’ In terms of pounds per horse, you’re getting Porsche-beating power for much less.
Conclusion: The Smart Choice for Enthusiasts and Collectors
The BMW M135i and M140i represent the perfect blend of performance, rarity, and driving enjoyment. Their status as the last rear-wheel-drive hot hatches and their legendary six-cylinder engines make them strong candidates for future classic status. For Millennials and Gen Z looking for a fun, engaging weekend car that could appreciate in value, these BMWs tick all the right boxes.
Whether you choose the raw N54 or N55-powered M135i, or the refined B58-powered M140i, all three variants offer an experience that modern hot hatches simply can’t replicate. Act fast, because clean, stock examples are becoming harder to find — but be wise with your research and look out for cars that have been crashed and repaired. Values aren’t increasing, yet. But they will in the future. Buy now, explain it to the wife later.
