BMW 3 Series Gran Turismo F34 Engines -The Complete UK Guide
Every engine fitted to the F34 Gran Turismo -from the four-cylinder N20 and N47 to the six-cylinder N55 and N57, plus the B48, B58 and B47 that arrived with the 2016 facelift. Real UK replacement costs and honest reliability data for BMW's most spacious 3 Series. Backed by real UK enquiries [BMW-VERIFIED].
Explore F34 Engines
BMW 3 Series Gran Turismo F34 Engine Codes -The Complete Database
Every engine fitted to the F34 specifically -including the pre‑LCI N‑series engines and the post‑LCI B‑series replacements.
Overview
BMW 3 Series Gran Turismo F34 -Overview
The F34 is a five-door fastback version of the F30 3 Series, launched at the 2013 Geneva Motor Show as BMW's answer to buyers wanting the elevated driving position and practicality of an SUV with the dynamics of a saloon.
Built on the long‑wheelbase F30 platform, it offers significantly more rear legroom and headroom than the standard 3 Series, with a 2,920 mm wheelbase and a liftback tailgate. The engine line‑up mirrored the F30's: four‑cylinder and six‑cylinder turbocharged petrols (N20, N55) and diesels (N47, N57). A 2016 Life Cycle Impulse brought the B‑series engine family (B48, B58, B47) with improved efficiency and reliability. Production ended in early 2020, with no direct successor -the F34 was a one‑generation model.
Key Facts
Platform
BMW F34 (long‑wheelbase F30 architecture, front‑engine, rear‑wheel drive or xDrive)
Predecessor
None (F34 was a new model line)
Successor
None (F34 was a one‑generation model)
Sibling body styles in this generation
F30 Saloon, F31 Touring
Market Intelligence
The 3 Series nameplate generated significant UK engine enquiries in 2025 [BMW-VERIFIED], with F34 demand concentrated on the four‑cylinder diesels and the B58‑powered 340i based on market patterns.
Best & Worst Engines
Best Value
B48B20 (320i/330i)
“The B48 four‑cylinder delivers up to 252 bhp -more than the N20 it replaced -with better reliability and fuel economy. In the F34's spacious body, it's the sensible choice that doesn't feel sensible.”
Who it's for: buyers who want daily‑driver usability with genuine performance.
Highest Risk
N20B20 (pre‑2015 320i/328i)
“The N20's timing chain guide wear is well‑documented -a failure that can destroy the engine. BMW revised the guides in 2015, but early cars remain a gamble without documented chain work. The plastic charge pipe is another common failure point.”
Who it's for: only buyers with documented timing chain replacement or post‑2015 cars.
Most Expensive Failure
N57D30T1 (335d xDrive)
“The twin‑turbo 3.0‑litre diesel is a masterpiece of torque delivery, but timing chain issues and swirl flap failures are well‑documented. A full engine replacement can exceed £8,000, and the xDrive system adds complexity to the removal process.”
Who it's for: buyers who want effortless torque and are prepared for the running costs.
Most Overlooked
N55B30 (335i, pre‑LCI)
“The N55 is often overshadowed by the later B58, but it's a characterful six‑cylinder with a proven track record. Oil leaks and charge pipe failures are its main weaknesses, but these are well‑understood and manageable. It's often cheaper to buy than the 340i.”
Who it's for: buyers who want six‑cylinder character on a tighter budget.
BMW 3 Series Gran Turismo F34 -Ownership Economics
The F34 rule
A £4,500–£7,000 B58 recon against a £10,000–£18,000 340i sits at 25–70% of the car's value -at the upper end, that brushes our 70% BMW scrap threshold. Against a £15,000+ example, the same recon drops to 30–47% -a repair decision, not a scrap question. For an N20 328i at £7,000–£12,000, a £2,500–£4,500 recon is 21–64% -borderline but often viable for a well‑kept example. Value the car first; if it's a pre‑2015 N20 or N47 without timing chain history, walk away or budget for the work immediately.
Key Takeaways
Which F34 Costs Least To Own?
B48B20 (320i/330i) -modern four‑cylinder, no major known issues, cheaper parts than the six‑cylinders.
Which F34 Costs Most To Own?
N57D30T1 (335d) -timing chain work is expensive, xDrive adds complexity, high running costs.
Which F34 Is Best Value?
B58B30 (340i) -the definitive F34 engine, modern reliability, strong performance.
Common Problems
F34 Engine Replacement Costs -By Engine and Condition
Core Variants
Diesel & Petrol Lineup
Diesel Variants
318d318d xDrive320d320d xDrive325d330d330d xDrive335d xDrive
Scope note: All variants listed are F34 Gran Turismo only. The F30 Saloon and F31 Touring share most of these engines but are covered on their own Generation Pages. The ActiveHybrid 3 combines the N55B30 with an electric motor for 335 bhp combined output.
Market Intelligence
Most Requested E90 Engines (2025)
- 1.1. B47D20A (320d) -pattern data
- 2.2. B58B30 (340i) -pattern data
- 3.3. N57D30T1 (335d) -pattern data
Most Requested E90 Variants
- 1.1. 320d
- 2.2. 340i
- 3.3. 335d xDrive
Average E90 Replacement Cost
£3,500–£6,500 (reconditioned, supply only) [BMW-QUOTE]
Most Common E90 Failures
- 1.1. N20/N47 timing chain guide wear (pre-2015)
- 2.2. N55 oil leaks & charge pipe failure
- 3.3. N57 timing chain & swirl flap failure
BMW 340i
F34 (B58)
3
enquiries
BMW 320d
F34 (N47)
3
enquiries
BMW 335d xDrive
F34 (N57)
2
enquiries
FAQ
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