BMW 5 Series G30 520d: Buyer’s Guide

Introduction

The BMW 5 Series G30 ran from 2017 to 2023, replacing the F10. Lighter body, new electronics, a wide engine range — BMW reset the bar in the executive class with this model. The 520d is the most common version: a 2.0-liter four-cylinder turbodiesel, an 8-speed ZF automatic, and 47–52 mpg in the combined cycle.

Buying a used diesel 5 Series means keeping three things in mind: the timing chain, the EGR valve, and the AdBlue (urea) system. Those, plus the rest of the inspection points, are covered below.

Specifications

Engine: B47 and B47TU

The engine came in two states of tune. The B47 — 190 hp and 295 lb-ft, from 2017 to 2020. The B47TU — 231 hp and 369 lb-ft, arriving with the 2020 facelift. You feel the difference immediately: 7.3 versus 6.8 seconds to 60 mph.

The B47 has a reputation for reliability. One caveat: early cars (2017–2018) can have timing chain issues. Whether it’s been replaced is the first question to ask the seller.

The EGR valve clogs over time. The result is lost power and rising fuel consumption. Ask whether it’s been cleaned or replaced. On the 520d, the AdBlue system handles exhaust aftertreatment: check that it works and that no fault codes are stored for it.

Transmission and Drivetrain

The 8-speed ZF 8HP automatic is reliable on one condition — the fluid was changed on schedule. Interval: every 37,000 miles, or per the manufacturer’s specification. A seller’s “filled for life” claim is a reason to look closer.

There are two drivetrains. sDrive is rear-wheel drive. xDrive is all-wheel drive: better traction, slightly higher fuel consumption. For most drivers, sDrive is enough. xDrive makes sense in frequent snow or rain, or if you want extra traction margin.

Suspension and Handling

The G30 is prized for its comfortable ride. With mileage, the suspension wears, and that becomes a line item.

• Rear air suspension (optional) — check for leaks.
• Shock absorbers — test on rough roads, listen for unusual noises.
• Steering — at high speed the wheel can feel heavy. On the G30 that’s normal, not a defect.

M suspension (optional) sharpens the handling. Not everyone likes it.

Electronics and Infotainment

There’s a lot of electronics in the G30, and it all needs checking.

• The “SOS call not available” message is common. It points to a telematics module (TCM) fault. The repair can be expensive.
• The active radiator grille should be closed with the engine off. Check both flaps — if they don’t close, the actuator has likely failed.
• Central screen — 10.25″ or 12.3″. Navigation should be current. The media system sometimes lags; a software update usually fixes it.
• Parking sensors and cameras — check every single one, replacement is expensive.

Common Problems and Owner Experience

• Pull. The 190-hp version feels strained and noisy accelerating on the highway. The 231-hp version is noticeably livelier.
• Fuel consumption. Official figures are low; real-world consumption is often higher — especially on short trips.
• Electronics. Beyond the SOS message, there are media system freezes and slow responses.
• Suspension. With M suspension, the ride gets firmer.
• AdBlue. A failed pump or sensor leads to starting problems.

Inspection Checklist

1. Service history and VIN check. Especially for imported cars. It reveals hidden damage and open service campaigns.
2. Timing chain. Confirm whether it’s been replaced, or have a specialist check it.
3. EGR valve. Cleaned or replaced?
4. AdBlue. System works, no fault codes.
5. Transmission fluid. Changed every 37,000 miles?
6. Body. Chips, scratches, repair traces — on door edges, hood, and trunk lid.
7. Tires and brakes. Tread, tire age, condition of rotors and pads.
8. Suspension and interior. Air suspension for leaks, electronics — all of it.

Equipment

A well-equipped car is not only more comfortable, it also holds its value better. Don’t buy a bare-bones base model — it’s harder to sell.

Worth looking for:

• Professional Navigation (Pro Nav);
• folding mirrors;
• adaptive cruise control;
• head-up display;
• comfort seats;
• parking assistant.

Maintenance

Scheduled maintenance on a BMW 5 Series costs more than average, but the G30 520d itself is reliable. The main line items:

• Scheduled service — minor and major, both moderate in cost.
• Timing chain replacement — an expensive job, comparable to a serious repair.
• Brakes — a full set of rotors and pads is moderate.
• Tires — price depends on size.
• Annual maintenance — a noticeable sum, depends on mileage and driving style.

A pre-purchase inspection by an independent BMW specialist isn’t a formality — it’s money saved.

Data Discrepancies

Three things to keep in mind:

1. Payload in the source data is listed as 530 liters. Liters measure volume, not mass. Most likely this refers to trunk volume — 530 L.
2. Top speed is identical for both versions — 146 mph — even though power, torque, and acceleration differ. Could be a limiter or inconsistent data.
3. The FAQ section mentions that the 231-hp version is slightly more economical, but the table for the 520d lists a single consumption range — 47–52 mpg — with no split by power output.

FAQ

Is the BMW 520d G30 reliable?
Overall, yes. The known issues are the timing chain on early cars and the electronics. Regular maintenance is critical.

What’s the difference between the 190 and 231 hp versions?
The 231 hp (from 2020) is the B47TU: more torque, better acceleration, and by owner accounts, slightly more economical.

sDrive or xDrive?
For most people, sDrive is enough. xDrive — for snow, rain, or if you want extra traction.

Can I buy an imported G30?
Yes, but with extra care. A VIN check is mandatory; verify registration and the full import history.

Verdict

The G30 520d is a solid compromise between comfort, economy, and premium status. If your budget allows, look for a 2020 or later car (LCI facelift): that’s the B47TU with 231 hp. Either way, get an independent inspection before the deal and negotiate based on whatever flaws you find.