Introduction
The BMW 5 Series G30 was built from 2017 to 2023 and replaced the F10. The sedan is lighter than its predecessor — weight savings reach up to 220 lb. That pays off in both fuel economy and handling.
The key used-market version is the 520d with the 2.0-liter four-cylinder B47 diesel. The engine pairs frugal fuel economy (47–52 mpg) with acceptable pace: 0–62 mph in 7.5 s and a 146 mph top speed. Below is what to look for when buying, which options genuinely add value, and which faults show up most often.
Specifications
| Spec | Value |
|---|---|
| Model | BMW 5 Series G30 (2017–2023) |
| Engine | 2.0-liter four-cylinder diesel (B47) |
| Power | 184 PS (before 2018) / 190 PS (from 2018) |
| Torque | 295 lb-ft |
| Transmission | 8-speed Steptronic (ZF) or 6-speed manual |
| Drivetrain | rear-wheel (Heckantrieb) or all-wheel (xDrive) |
| 0–62 mph | 7.5 s (rear-wheel drive, automatic) |
| Top speed | 146 mph |
| Fuel economy (combined) | 47–52 mpg (depends on trim) |
| CO₂ emissions | 118–132 g/km |
| Trunk capacity | 530 L |
| Curb weight | up to 220 lb less than the F10 |
| Central display | 10.25 in |
What Doesn’t Add Up in the Source Data
In the source table, torque is listed as 295 lb-ft for both the pre-2018 version and the 2018-on version. Power, meanwhile, rises from 184 to 190 PS. A power increase with unchanged torque looks questionable — verify both figures against the documents for the specific car.
The 2018 boundary is described two ways in the source: the introduction says “from 2018, 190 PS, before that 184 PS,” while the table says “184 PS (before 2018) / 190 PS (from 2018).” Both wordings are preserved, but the actual changeover year needs to be confirmed by VIN.
Engine and Transmission
The B47 is a well-known and generally sturdy engine. The main points to check during an inspection:
- Timing chain. Isolated timing chain complaints are documented on early build years (2017–2018). The sign of a careful owner is regular oil changes every 6,000–9,000 miles plus a full service history.
- Turbocharger. Can wear at high mileage. Listen for unusual noises and check for power loss.
- DPF. Short trips clog the filter. Ask whether the car was driven mostly on the highway.
- Transmission. The 8-speed ZF Steptronic is considered very reliable. Its fluid is changed every 50,000–62,000 miles — ask whether that was done.
Under hard acceleration on the highway, the four-cylinder diesel sounds strained and louder. That’s normal for this engine. What should raise a flag is something else: excessive noise or jerking.
Suspension, Electronics, Brakes
- Rear air suspension (on some versions) can lose its seal over time. Check that the body sits level.
- Brakes wear quickly with a spirited driving style. Check pad and rotor thickness.
- Cooling system. At high mileage the water pump can leak. Check the level and look for traces of coolant (antifreeze).
- iDrive. Occasionally glitches; a dealer can usually fix it with a software update.
Body: How to Spot Accident Damage
The G30’s body is neatly assembled, but accident-damaged examples are common. Look at:
- Reflections on the door panels, fenders, and bumpers — a giveaway of respray.
- Panel gaps on the doors, hood, and trunk lid. Uneven gaps point to an impact.
- Corrosion. The body is galvanized, but stone chips at the front and in the wheel arches can still rust. Inspect these zones separately.
- Moisture and mold in the footwells — a hint at leaks.
Chips and cracks in the body, plus any signs of moisture, are a direct reason to haggle or walk away from the car.
History and Documents
- VIN check is mandatory: theft, open recalls, plausibility of the mileage.
- Service history. A complete service book is a good sign. Look at how regular the oil changes and scheduled maintenance were.
- Maintenance/inspection report, if one exists — review it for defects.
Separately, there’s a source-data problem worth flagging: the quote about imports from Germany and the UK refers to the F10 but was carried over to the G30 without evidence. Cars do frequently arrive from Germany and the UK, so check the VIN history with extra care.
Options: What’s Worth Paying For
Base equipment on the G30 is already generous. On the used market, value is added by:
- The large 10.25-inch central display — more capable and nicer to use.
- Navigation Professional (Pro Nav) — better maps, higher resolution, and useful services like real-time traffic information.
- Comfort seats. The base seats can be uncomfortable on long trips — always test your seating position. Seats with extended adjustments are worth it.
- Folding exterior mirrors, Head-Up display, adaptive cruise with Stop-and-Go, plus the Harman Kardon or Bowers & Wilkins audio systems.
Pre-LCI and LCI (2020)
In 2020 the G30 received its update (LCI). The changes covered:
- Lighting — new headlights, a larger radiator grille, reworked bumpers.
- Tech — the current iDrive version and new driver assistants.
- Engines — the 520d barely changed; output was nudged up slightly.
If the budget allows, the LCI is the better pick: more modern and it holds residual value better. The pre-LCI remains a sensible choice too — provided the spec and the care are there.
Ownership Costs
Running a 520d costs more than a mainstream sedan. Insurance depends on the class and the region and can be noticeable. Scheduled maintenance at an official BMW dealer runs above average for the class. Wear items — brakes, tires, suspension components — are quality but not cheap. Tax is moderate thanks to low CO₂ emissions (118–132 g/km).
Budget a separate reserve for unplanned repairs. Especially if you’re buying a high-mileage car.
Common Problems — Summary Table
| System | What Goes Wrong | How to Check |
|---|---|---|
| Timing chain | Issues on early years (2017–2018) | Full service history; oil changes every 6,000–9,000 miles |
| Turbocharger | Wear at high mileage | Noise, power loss |
| DPF | Clogging from short trips | Confirm the car was driven on the highway |
| ZF 8HP automatic | Reliable but needs servicing | Was the fluid changed every 50,000–62,000 miles? |
| Air suspension (rear) | Leaks after a few years | Whether the body sits level |
| Brakes | Quick wear with spirited driving | Pad and rotor thickness |
| Cooling system | Water pump leak at high mileage | Coolant leak |
| iDrive | Glitches | Software update at the dealer |
What Owners Say
Owners praise the car for comfort, quiet, and fuel economy: the 520d is easy to live with over long distances, and the chassis balances comfort with composure.
Criticism centers on two things. First, the engine note under load (the motor “strains” and gets louder). Second, the base seats on long hauls — hence the recurring advice to pay extra for the comfort seats.
FAQ
Is it true the 520d has a weak timing chain?
The problems were limited to early build years — 2017–2018. The deciding factor is a full service history and regular oil changes.
Is the performance enough?
For highway and city, yes. But under hard acceleration the engine sounds strained — that’s the nature of a four-cylinder diesel.
Automatic or manual?
The 8-speed ZF Steptronic is solid. The only condition is a fluid change every 50,000–62,000 miles.
Bottom Line
The BMW 520d G30 is a sensible choice for anyone who wants a comfortable, frugal executive sedan. But buying used takes discipline: check the VIN and the history, the timing chain on early build years, and how the transmission behaves.
The single most important step before the deal is an independent inspection, including a body check for accident damage and moisture.
Related Articles
- BMW 5 Series F10: Review and Weak Points
- BMW B47 Diesel: Design and Common Faults
- G30 Pre-LCI vs LCI Differences
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