BMW

The short version

BMW is a broad brand, but the cars that matter to enthusiasts are the M models. The M3 and M5 have spent decades combining rear-wheel drive, powerful engines and practical bodies. That formula is why clean E30 and E46 M3s are now expensive, and why the modern G80 M3 is one of the best all-round performance cars you can buy.

The risk is that BMW's mainstream models share the badge but not the engineering. A 320d is not an M3, and a cheap M car with a patchy history can cost far more than a good one.

The models that define the brand

The E30 M3 was homologated for touring-car racing and has become a blue-chip collector car. The E36 and E46 M3 widened the appeal, with the E46's S54 inline-six becoming a modern classic. The E90/E92 M3 moved to a V8, the F80 returned to a turbocharged six, and the G80 added all-wheel drive and a much larger footprint.

The M5 follows the same arc. The E28 and E34 are rare and climbing, the E39 is a modern classic, the E60 brought a V10, and the F90 added twin-turbo V8 power and all-wheel drive. The M2 is the compact alternative, and the M4 is the coupe version of the M3.

What it costs to own

A routine service on a modern M car typically costs £400 to £900, with major intervals higher. Tyres are £700 to £1,200 a set, and brakes are £600 to £1,200 depending on the model. Older M cars add rod-bearing, VANOS and cooling-system risks.

The E46 M3's S54 engine can suffer rod-bearing failure, and the rear subframe mounts need inspection. The E92 M3's S65 V8 also has rod-bearing risk. The F80 M3 and F82 M4 can suffer crank-hub issues on tuned cars. The N54 engine in the 335i has known high-pressure fuel pump, injector and wastegate problems.

Known weak points

• E30: rust in the scuttle, jacking points and rear arches; tired suspension.
• E46: rear subframe cracks, rod bearings, VANOS and cooling systems.
• E92: rod bearings, throttle actuators and idle-control valves.
• F80/F82: crank hub on modified cars, charge pipes and intercoolers.
• F90 M5: transfer case, differential and complex electronics.
• Mainstream turbo cars: N54 fuel-system faults and timing-chain issues on some engines.

What to check before buying

Start with the service history and a pre-purchase inspection from a BMW specialist. On an E46, inspect the rear subframe mounts and ask whether the rod bearings have been replaced. On an E92, check the rod-bearing service history and listen for throttle-actuator faults. On a tuned F80, ask who mapped it and whether the crank hub has been addressed.

Check the body for accident repairs and the underside for rust. These cars are often driven hard, so tyres, brakes and suspension consumables should be assessed as part of the deal.

Market and depreciation

The E30 M3 is a collector car with strong values. The E46 M3 has risen sharply, and low-mileage examples are expensive. The E92 M3 is still relatively affordable but climbing. The F80 and G80 depreciate like modern performance cars, while limited editions and CS models hold value better.

The M5 follows a similar pattern: E39 and E60 are climbing, F90 is depreciating, and the newest cars are still in their early curve.

Who it suits

BMW M suits a buyer who wants one car to do everything: commute, track day and long journey. It also suits a collector who buys on history and originality. It does not suit someone who wants a low-cost classic, because rust and engine work can be severe.

The E36 M3 is the underrated one. It is lighter and simpler than the E46, and clean examples are climbing. The E39 M5 is a modern classic with a naturally aspirated V8, and it is more usable than the E60 M5 with its V10 and SMG gearbox. The E60 is the riskiest of the modern M5s because the V10 has rod-bearing and throttle-actuator issues.

The M2 is the compact alternative to the M3, and the M4 is the coupe. The G80 M3 and G82 M4 are fast and capable, but they are heavy and the styling divides opinion. The M340i and M440i are not full M cars, but they offer most of the performance for less money.

A pre-purchase inspection is essential on any older M car. The cost of putting one right can easily exceed the difference between a cheap car and a good one.

The E46 M3 SMG gearbox is another weak point, and many buyers prefer the manual. Rust is the biggest risk on the E30. A compression test and a leakdown test are worth doing on any high-mileage M engine.

How this profile was compiled

This profile uses BMW's published model history, service information, owner reports from Bimmerpost, and current UK market listings. It is not a road test.