BMW M2 vs M3: Which Is Better Value as a Used Buy in the UK?
Photo by Zuka Zurabishvili on Unsplash
Both the F87 M2 and F80 M3 use the same S55 engine. Both are rear-wheel drive, manual or DCT, and built on the same generation of BMW M architecture. On paper, they are closer than their price difference suggests. In practice, they are quite different cars to own, insure, maintain, and live with day to day — and for most UK buyers working within a budget, those differences matter more than the spec sheet.
This guide cuts through the noise. We're comparing the F87 M2 and F80 M3 as used buys in the current UK market — engine differences, running costs, parts availability, insurance, and which one makes more sense depending on what you actually want from it.
The Engines: N55, S55 — What's the Difference?
F87 M2 standard — the N55
The standard F87 M2 (2016–2018) uses the N55, a 3.0-litre single twin-scroll turbo straight-six producing 370bhp. The N55 is not an M-developed engine. It is the same unit used in the standard 335i, 435i, and X5 35i — a thoroughly proven, well-understood, and relatively reliable engine with a strong independent specialist support network in the UK.
The N55 has known issues — valve cover gasket leaks and oil filter housing leaks are common on higher-mileage examples, and the charge pipe can crack under sustained boost — but none of these is catastrophic. Parts are cheap and widely available. A well-maintained N55 routinely exceeds 150,000 miles.
F87 M2 Competition — the BMW S55 engine
The M2 Competition (2018 onwards) uses the BMW S55 engine, the full M-developed twin-turbocharged 3.0-litre unit producing 410bhp. This is the same engine as the F80 M3 and F82 M4, detuned slightly from the M3's 431bhp. The S55 is a performance-focused engine with specific maintenance requirements, principally around rod bearings.
The BMW S55 motor has a documented rod bearing wear concern that is now well understood by the UK M car community. Proactive bearing replacement at 40,000 to 60,000 miles is considered standard preventative maintenance by any experienced M specialist. Cost at an independent: £1,500 to £2,500. Cost of ignoring it and waiting for failure: potentially an engine rebuild.
F80 M3 — also S55
The F80 M3 uses the same BMW S55 engine at 431bhp (slightly higher than the M2 Competition's 410bhp in standard tune). The maintenance requirements and reliability characteristics are identical to those described above. What the M3 adds is four doors, a larger and heavier body, and, in the UK used market, a significantly higher price.
N55 vs S55 reliability summary: The N55 in the standard M2 is the more straightforward engine to own. Well-documented, cheaper to service, and without the rod bearing concern that defines S55 ownership. The S55 in the M2 Competition and M3 is the more capable engine, but demands proactive maintenance. A neglected S55 is an expensive problem; a maintained S55 is a rewarding one.
Used Price Comparison in the UK
At the time of writing, a clean low-to-mid mileage F87 M2 (standard, manual, good spec) sits in the £22,000 to £28,000 range. An M2 Competition at equivalent mileage runs from £26,000 to £34,000. A clean F80 M3 (Competition or standard, similar mileage and history) sits from £28,000 to £40,000 depending on spec, history, and whether it has desirable options.
For the same money you would spend on a well-specified F80 M3, you can buy an M2 Competition and have several thousand pounds remaining for maintenance, tyres, or insurance. That gap is meaningful.
Side-by-Side Comparison
Insurance and Running Costs
Insurance is a real differentiator in the UK market. The F87 M2 sits in a lower insurance group than the F80 M3. For UK drivers under 35, this can mean a difference of several hundred to over a thousand pounds per year in premiums. Over a three to five-year ownership period, this compounds into a meaningful total cost advantage for the M2.
Tyres are a significant running cost for both cars. Both are rear-wheel drive, and both reward the use of their performance, which means rear tyre life of 8,000 to 15,000 miles on the road, depending on use. The M3's wider body and slightly larger rear tyres marginally increase tyre costs per set.
Service parts: oil, filters, brake pads, and spark plugs are largely the same between the two cars, given the shared S55 engine on the Competition/M3 comparison. The N55 in the standard M2 is marginally cheaper to service, given its non-M parts crossover with standard 3 Series models.
Which Is More Reliable?
Both cars share their most significant reliability variable. The S55's rod bearing concern, when comparing the M2 Competition to the F80 M3. In that comparison, reliability is essentially equal. The decision is about price and practicality, not mechanical superiority.
The standard M2 with the N55 is the most reliable of the three variants. The N55 is one of BMW's most proven modern engines. It has none of the rod bearing concerns of the S55, and the wider BMW M parts availability means repairs are cheaper when they are needed. If reliability is the primary concern, the standard M2 with the N55 is the answer.
When checking an F80 M3 or M2 Competition S55 engine, ask for rod bearing documentation before anything else. If it hasn't been done and the car is over 40,000 miles, negotiate accordingly or factor the cost in.
The Verdict
For most buyers in the UK, the F87 M2 is the better value used buy. It is lighter, cheaper to purchase, cheaper to insure, and available with the more reliable N55 engine. The M2 Competition closes the gap to the M3 on performance but maintains the M2's size and price advantages.
The F80 M3 makes sense for buyers who genuinely need four doors, families, drivers who regularly carry passengers, or who want the M3 badge specifically. As a performance driving tool, the M2's lighter weight and tighter dimensions give it a genuine dynamic edge over the heavier M3 on a B-road or a track.
Neither is a bad car. The M2 is simply the more compelling package for most buyers who come to it with an honest assessment of what they need.
Frequently Asked Questions
Is the BMW M2 or M3 more reliable?
The standard M2 with the N55 engine is the most reliable of the group. The N55 is a thoroughly proven unit without the S55's rod bearing concern. Between an M2 Competition and an F80 M3 (both S55), reliability is essentially equal. The S55 is a capable engine when maintained proactively; the key item is rod bearing replacement by 60,000 miles.
Is the BMW S55 engine reliable?
Yes, with the rod bearing proviso. The BMW S55 motor is a robust high-performance engine that, when the rod bearings are replaced proactively and oil changes are kept short, is capable of high mileages without failure. The S55 has powered M3, M4, and M2 Competition cars to 100,000 miles and beyond without drama. Neglect is the risk, not the engine itself.
What is the difference between the N55 and S55?
The N55 is BMW's standard production 3.0-litre turbo straight-six — found in 335i, 435i, M2, and X5 35i models. It produces 306–370bhp depending on application and is a reliable, widely serviced unit. The BMW S55 engine is an M-developed twin-turbo unit producing 410–450bhp. It has closer-tolerance rod bearing specifications that require proactive maintenance. Both are straight-sixes but are mechanically distinct beyond sharing displacement.
Are BMWs reliable as daily drivers?
Yes, when maintained correctly. The most reliable BMWs as daily drivers are those with the B47 diesel, B48 petrol, or B58 petrol engines. All modern, well-engineered units with solid track records. Performance variants like M2 and M3 are reliable daily cars too, but with higher maintenance requirements and running costs. The most reliable BMW is the one with a full service history and short oil change intervals.
What is the most reliable BMW to buy used?
The G20 320d with the B47 engine or the G20 320i/330i with the B48 are consistently regarded as among the most reliable used BMWs. For performance buyers, the standard F87 M2 with the N55 is the most reliable M car in the current used market. The B58-powered G80 M3 is shaping up to have an excellent reliability record, but is newer and more expensive used.
Should I buy an M2 or M3 for track use?
The M2 is the better track car in most scenarios. It is significantly lighter (approximately 160kg less than an F80 M3), has a shorter wheelbase that makes it more responsive, and its lower used price means the financial exposure of track-induced wear is lower. The M3's four doors add nothing on track. The M2 is the focused choice.
Disclaimer: Prices referenced in this article reflect the UK used market at the time of writing and will change. All reliability observations are based on widely reported owner experience and independent workshop data, not a controlled study. Individual cars vary significantly based on service history and use.
