Our Verdict
The 3 Series is the definitive compact executive car — beautifully balanced, well-equipped, and surprisingly practical. The F30/F31 offers exceptional value as prices have fallen significantly. Budget for higher running costs and watch for N47 diesel timing chain issues.
Introduction
BMW's 3 Series has been the sports saloon benchmark since the E21 in 1975. The F30 (2012–2019) refined the formula with lighter construction and more efficient engines, while the G20 (2019–present) went further with a stiffer chassis and the latest iDrive system.
As a used buy, the 3 Series offers compelling value. The F30 has depreciated heavily — a well-specified 320d that cost £35,000 new can be had for under £10,000. That's a lot of premium car for the money.
Running costs are higher than a typical family hatchback, but careful engine choice and independent specialist servicing keep costs manageable. The key is knowing which engines to trust.
Pros & Cons
✓ Pros
- Best driving dynamics in the compact executive class
- Strong depreciation makes used F30 models excellent value
- Rear-wheel drive gives genuine driver engagement
- Excellent diesel engines — 320d is one of the best ever made
- Premium interior with high-quality materials
- Touring (estate) is one of the most practical in class
✗ Cons
- N47 diesel engine timing chain failures are well-documented
- Higher running costs than mainstream rivals (tyres, brakes, servicing)
- Run-flat tyres are expensive and give a harsh ride
- Complex electronics can be expensive out of warranty
- Rear-wheel drive can be tricky in winter without winter tyres
- BMW dealer servicing is very expensive — find an independent
Known Issues & Common Problems
N47 timing chain failure
High RiskThe N47 2.0 diesel (316d, 318d, 320d 2007–2014) has a rear-mounted timing chain that can stretch and fail, destroying the engine. BMW revised the design in 2014 with the B47. Listen for chain rattle from the back of the engine on cold start.
When to check: Any mileage on pre-2014 N47 dieselCoolant system plastic components
Medium RiskBMW cooling systems use plastic components that become brittle with age. Expansion tank, thermostat housing, and hoses can crack. Check for low coolant or white residue. Budget £200–£500.
When to check: 60,000+ milesElectric water pump failure
Medium RiskPetrol models use an electric water pump that can fail without warning. Replacement £400–£700. Failed pump leads to overheating and potential head gasket damage.
When to check: 60,000–100,000 milesOil filter housing gasket leak
Medium RiskVery common on both petrol and diesel. Oil seeps from the filter housing gasket. Not critical but should be addressed. £150–£300 repair.
When to check: 50,000+ milesMOT Insights
Common MOT Failures
- Suspension spring broken
- Brake disc thickness below minimum
- Headlamp aim
- Exhaust lambda reading (diesel)
Common Advisories
- Corroded brake discs
- Oil leak from engine
- Front suspension wear
- Inner rear tyre wear
Inner rear tyre wear is very common and often indicates worn rear suspension bushes. Budget £300–£500 for rear arm and bush replacement. Coil springs also snap frequently on UK roads.
Running Costs
| Insurance Group | 18–42 |
| Annual Road Tax | £0–£165 |
| Fuel Economy | 35–65 mpg |
| Service Interval | Condition-based (typically 15–20k miles) |
| Typical Service | £200–£350 (independent) |
| Major Service | £350–£600 (independent) |
| Timing | Chain (all models — check N47 tensioner) |
| Tyres | £100–£180 each (225/45 R18, run-flat) |
Used Price Guide
Frequently Asked Questions
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