Introduction
The BMW 5 Series G30 is the seventh generation of the 5 Series, replacing the F10. It debuted at the 2016 Frankfurt Motor Show and ran from 2017 to 2023. The body got lighter thanks to extensive aluminum use, and the driver-assist suite grew.
The 520d with the B47 diesel is the entry point of the range, but it’s the one high-mileage drivers pick. Performance, comfort, and fuel economy are balanced here. Whether the car holds up over the long haul is a question owners answer from experience, not from brochures. Below is a reliability breakdown of the 520d G30 based on forum posts (BMWpassion, Quattroruote, Reddit) and reviews on Trustpilot and Autoxy, plus a comparison of buying versus long-term rental (NLT).
The B47 Engine and Its N47 Predecessor
The B47 is a 2.0-liter four-cylinder turbodiesel. In standard form it makes 190 hp, in the xDrive version 231 hp, with 295 lb-ft of torque. It’s the successor to the N47, which earned a reputation for timing chain problems.
The timing chain in the B47 was redesigned, and reliability improved noticeably. Even so, the engine isn’t defect-free. Based on owner reports, chain stretch can show up after 93,000 miles, so a preventive replacement is typically planned around 124,000 miles.
Oil consumption is the second theme. Some B47 engines burn oil, in extreme cases up to 1.06 qt per 1,000 miles. Moderate consumption is considered normal by owners. If consumption goes beyond that, piston rings or the PCV valve will need replacing. That said, many owners have passed 124,000 miles without major failures — provided the service schedule is followed.
Transmission
The 520d G30 came with either a 6-speed manual or the ZF 8HP automatic — an eight-speed gearbox prized for its smoothness. The automatic is considered reliable, but without an oil change every 50,000–62,000 miles, jerking and delayed shifts appear.
Suspension and Chassis
The base configuration is rear-wheel drive, with xDrive all-wheel drive optional. Adaptive dampers (optional) and good sound insulation deliver the comfort-and-handling balance the G30 is praised for.
The weak link is the rear air springs. Over the years they can lose air and the car sags. Replacing a single air spring is an expensive job. Some owners take a drastic step: they disable the air suspension and fit conventional coil springs to cut costs.
Electrical and Electronics
The G30’s electronics behave like those of most modern cars: minor glitches happen. The most common complaints are about the iDrive system and parking sensors. iDrive can freeze or lag — in many cases a software update fixes it. If the problem persists, the head unit has to be replaced, and that’s expensive.
Specifications
| Parameter | Value |
|---|---|
| Engine | 2.0 L, 4 cylinders, turbodiesel (B47) |
| Power | 190 hp (standard) / 231 hp (xDrive) |
| Torque | 295 lb-ft |
| Transmission | 6-speed manual or ZF 8HP automatic |
| Drive | rear-wheel drive (standard) or xDrive all-wheel drive |
| 0–62 mph | 7.5 s (standard) / 6.9 s (xDrive) |
| Top speed | 146 mph |
| Fuel consumption (claimed) | 43–52 mpg |
| Fuel consumption (combined) | 39–47 mpg |
| CO2 emissions | 119–129 g/km |
| Curb weight | 3,560 lb |
| Trunk volume | 18.7 cu ft |
Common Faults and Fixes
Oil consumption. Up to 1.06 qt per 1,000 miles in extreme cases. With excessive consumption — replace piston rings or the PCV valve.
Timing chain. Stretch after 93,000 miles. Preventive replacement around 124,000 miles.
ZF 8HP gearbox. Jerking and delayed shifts if the oil isn’t changed every 50,000–62,000 miles.
Rear air suspension. Air loss, sagging. Options are replacing the air spring or switching to conventional coil springs.
DPF and EGR. The diesel particulate filter and exhaust gas recirculation valve clog up in city driving. Highway trips are needed for regeneration.
Electronics. iDrive freezes and lag, parking sensor faults. Often fixed with a software update.
Service Schedule
| Intervention | Interval |
|---|---|
| Service (oil, filters) | every 9,300 miles or once a year |
| Air filter | every 19,000 miles |
| Cabin filter | every 19,000 miles |
| Front brake pads | every 25,000–37,000 miles |
| Brake discs | every 50,000 miles |
| Battery | every 5–7 years |
| Diesel particulate filter (DPF) | every 62,000–93,000 miles (as needed) |
| Accessory (serpentine) belt | every 62,000 miles |
Maintenance costs are above average but stay within the premium segment. Dealer service is expensive; independent BMW specialists cut the cost. After five years of ownership, running costs on a BMW typically climb.
Real Owner Experience
93,000 miles without problems. An owner of a 2017 520d G30 on the BMWpassion forum covered 93,000 miles with no mechanical failures. He changed oil and filters every 9,300 miles; the only unplanned item was the battery after 5 years. He recommends the car to anyone who drives a lot.
DPF trouble. Another owner (Quattroruote) had the diesel particulate filter fail at just 50,000 miles due to city driving. The replacement was expensive, and the car ran fine afterward. The case shows how important a mixed driving cycle is.
Five years of ownership. An Autoxy user: a 2018 520d, about 19,000 miles a year, 93,000 miles over 5 years, “still in excellent condition.” Maintenance is expensive, but reliability is total.
Rent or buy. On Reddit, people debated whether to keep the car past warranty. Some say BMW running costs climb after 5 years and NLT spares you surprises. Others counter that a well-maintained car lasts a long time.
Buying or Long-Term Rental (NLT)
Buying. The car is yours — you can personalize it and keep it as long as you like. With a solid example, total costs over the long run come out lower than NLT. The downsides are depreciation (especially in the first years), unexpected costs after warranty, and handling the service schedule yourself.
NLT. A fixed monthly payment that covers maintenance, insurance, and tax. Contract-covered breakdowns are mostly included, and you can swap cars every 3–4 years. But over 4 years, rental costs more in total than buying, there’s an annual mileage cap, and cosmetic damage penalties apply. You never own it — the car goes back.
Contradictions in the Source Data
- Fuel consumption. The table gives 43–52 mpg (claimed), while the intro text says 39–47 mpg combined. The figures don’t match.
- DPF replacement interval. The table lists 62,000–93,000 miles, but a real-world case records DPF failure at 50,000 miles.
- xDrive performance. The xDrive version is listed as both more powerful (231 hp) and faster (6.9 s vs 7.5 s), even though all-wheel drive is usually heavier. The data is internally inconsistent.
- Oil change interval. The table says 9,300 miles, which matches the real-world case, yet service is described as expensive despite the frequent interval.
FAQ
Does the B47 timing chain last longer than the N47’s? The chain in the B47 was redesigned and is more reliable. But its service life is still limited: stretch is possible after 93,000 miles, and preventive replacement is planned around 124,000 miles.
Can I drive city-only? Not advisable. City driving clogs the DPF and EGR; regular highway trips are needed for regeneration.
When should I change the oil in the ZF 8HP? Every 50,000–62,000 miles. Without it, jerking and delayed shifts appear.
Verdict: Who the 520d G30 Is For
The 520d G30’s mechanicals hold up for a long time if you follow the service schedule. The main issues are electronics and wear items — DPF, air suspension, timing chain. Maintenance is above average but within the premium segment.
Who it’s for: those who cover a lot of miles and are willing to keep up with the car. If your priority is zero hassle and predictable spending, NLT is the closer fit, but it costs more in total. The key step before buying is to check the service history and make sure the previous owner didn’t drive city-only.