The F30 3 Series: eight engines, wildly different reliability
The BMW F30 (2012–2019) is one of the most popular used cars in Europe. But not all F30s are created equal — the engine under the bonnet makes all the difference. EngineScope tracks 8 engines that powered the F30, with reliability scores ranging from 35/100 (AVOID) to 93/100 (BEST).
Choosing the right engine-year combination can save you thousands in repairs.
Every F30 engine ranked
| Engine | Models | Score | Verdict | Key risk |
|---|---|---|---|---|
| B58 3.0T I6 | 340i (2015+) | 93/100 | BEST | None significant |
| B48 2.0T I4 | 320i/328i LCI (2015+) | 82/100 | BUY | Minor — oil filter housing gasket |
| B47 2.0d I4 | 318d/320d LCI (2015+) | 80/100 | BUY | DPF on short trips |
| N55 3.0T I6 | 335i (2012–2015) | 76/100 | BUY | Valve cover gasket, VANOS |
| B38 1.5T I3 | 318i (2015+) | 72/100 | BUY | Not exciting, but reliable |
| N20 2.0T I4 | 320i/328i (2012–2015) | 58/100 | CAUTION | Timing chain recall |
| N13 1.6T I4 | 316i (2012–2015) | 55/100 | CAUTION | Prince engine timing chain |
| N47 2.0d I4 | 316d/318d/320d (2012–2014) | 35/100 | AVOID | Catastrophic timing chain |
The best choice: B58 340i (2015+) — 93/100
If budget allows, the B58-powered 340i is arguably the best engine BMW has ever made. Forged internals, overbuilt from factory, and proven to 300,000+ km. It's also a monster for tuning — remaps to 400+ hp on stock internals are common.
Why it scores 93: no major design flaws, strong construction, excellent long-term data.
View full B58 reliability report →
Best value: B48 320i/330i LCI (2015+) — 82/100
The B48 is the best modern four-cylinder BMW engine. Smooth, efficient, and maps well to 260 hp. The LCI (facelift, late 2015+) F30 models use the B48 instead of the problematic N20.
Known issues: oil filter housing gasket leak (€300–€500 fix), occasional coolant loss. Nothing catastrophic.
The key rule: if buying a 320i or 328i, make sure it's a 2016 or later model with the B48. The pre-LCI N20 is a different story.
View full B48 reliability report →
Best diesel: B47 320d LCI (2015+) — 80/100
The B47 fixed the N47's fatal flaw by moving the timing chain to the front of the engine. It's a proper torque monster (400 Nm) that sips fuel on the motorway.
Avoid if: you only do short city trips. The DPF will clog and cause expensive problems (€1,500–€2,500).
The diesel rule: B47 = good. N47 = walk away.
View full B47 reliability report →
Solid but ageing: N55 335i (2012–2015) — 76/100
The N55 fixed most of the N54's reliability nightmares. It's a proven 3.0L turbo six with 200,000+ km track record. Known issues (valve cover gasket, VANOS solenoids, charge pipe) are well-documented and relatively cheap to fix.
Best for: enthusiasts who want a fast, tuneable six-cylinder without the B58 price tag.
View full N55 reliability report →
Caution zone: N20 320i/328i (2012–2015) — 58/100
The N20 is a punchy 2.0 turbo, but it has a well-documented timing chain guide failure that led to a class-action lawsuit. Cars built between 2012–2015 are most affected.
If considering an N20: - Check if the timing chain has been replaced (updated part fixes the issue) - Budget €1,500–€2,500 for preventive replacement if not done - Post-fix, the N20 can run 200,000+ km reliably
View full N20 reliability report →
Avoid: N47 diesel (any year) — 35/100
The N47 deserves its own article — read it here. The rear-mounted timing chain is a fatal design flaw. The chain stretches, the engine dies. Replacement costs €2,000–€4,000 and requires engine removal.
Early F30 diesels (2012–2014 318d/320d) use the N47. Always check the production date. A 2015 320d uses the B47 — completely different engine, completely different reliability.
View full N47 reliability report →
The golden rule: LCI or nothing
The F30 received a Life Cycle Impulse (LCI) facelift in mid-2015, which brought the modular B-series engines:
| Pre-LCI (2012–2015) | LCI (2015–2019) |
|---|---|
| N20 (timing chain risk) | B48 (reliable) |
| N13 (Prince engine) | B38 (adequate) |
| N47 (catastrophic risk) | B47 (fixed design) |
| N55 (solid) | B58 (excellent) |
The pattern is clear: LCI models are significantly more reliable across the board. If you're buying an F30 today, the 2016+ model year is the sweet spot — depreciation has hit, B-series engines are fitted, and parts availability is excellent.
Summary: what to buy
- Dream pick: 340i B58 (2016+) — best BMW engine ever, 93/100
- Best value petrol: 320i/330i B48 (2016+) — smooth, efficient, 82/100
- Best diesel: 320d B47 (2016+) — fixed N47 flaws, 80/100
- Budget option: 335i N55 (2012–2015) — proven, tuneable, 76/100
- Avoid: any pre-LCI diesel (N47) or pre-fix N20