BMW X5 G05 Buyer's Guide: Engines, Reliability & What to Check
A condensed buyer's guide to the BMW X5 G05 (2018–present): the engines worth trusting, the transfer case lawsuit you should know about, and what to check before buying used.
The BMW X5 G05 (2018–present, LCI facelift from 2023) is generally the safer bet in the X5 lineup — but "safer" doesn't mean risk-free. This is a condensed version of our full research: the engines actually worth trusting, the one mechanical issue with real legal documentation behind it, and a practical checklist for viewing a used one.
Quick answer
The xDrive40i (B58) is the most sensible all-round choice — its reputation as one of BMW's best modern engines is largely earned, though not problem-free (oil filter housing, water pump, and an early oil pump issue on 2019–2021 cars). The xDrive30d (B57) diesel is excellent for high annual mileage. The biggest documented risk on a used G05 isn't the engine at all — it's the xDrive transfer case, the subject of an active US class-action lawsuit, and air suspension wear. Always run a VIN history check before trusting a seller's claims about service history or mileage.
Key takeaways
- B58 (petrol, xDrive40i) has a largely earned reputation for reliability, but watch for oil filter housing leaks, water pump failures, and a plastic-component oil pump issue concentrated in 2019–2021 engines.
- B57 diesel is durable on long distances but sensitive to short, urban-only driving because of the DPF/EGR system.
- The xDrive transfer case is the subject of an active US class-action lawsuit (2019–2025 model years) over shuddering and jerking on turns — more documented risk than anything tied to the engines.
- Air suspension improves comfort noticeably but is a wear item, not an if-it-fails component — budget for it if the car has it.
- The PHEV versions (45e/50e) only make sense with reliable home charging; on a depleted battery, fuel economy is comparable to or worse than a plain xDrive40i.
What is the BMW X5 G05
The G05 is the third modern generation of the X5, built on BMW's CLAR platform shared with the 5, 7 Series and X7. It replaced the N55/N57-powered F15 with the newer B58 (petrol) and B57 (diesel) engine families — a genuine reliability step up on paper and, largely, in practice. The LCI facelift (mid-2023) brought a new curved display running iDrive 8, a reshuffled engine lineup (M60i replacing M50i, xDrive50e replacing xDrive45e), and an expanded 48V mild-hybrid system across most of the range.
Engines at a glance
| Engine | Code | Output | Notes |
|---|---|---|---|
| xDrive30d | B57 (I6 diesel) | 265 hp / 620 Nm | Best for high mileage, sensitive to short trips |
| xDrive40d / M50d | B57 (I6 diesel) | 340–400 hp | Same diesel risks, M50d adds tri-turbo complexity |
| xDrive40i | B58 (I6 petrol) | ~340–381 hp | The safest all-round pick |
| xDrive50i / M50i / M60i | N63 / S63 / S68 (V8tt) | 450–530 hp | More complex, pricier to maintain long-term |
| xDrive45e / 50e | B58 + electric motor | 389–489 hp combined | Only worth it with home charging |
B58 vs B57: which engine
If you drive 20,000+ km a year, mostly motorway, the B57 diesel wins on running cost and low-end torque. If you're mostly in the city or under 15,000 km/year, the B58 petrol is the more sensible choice — it skips the DPF/EGR/AdBlue system entirely, which is the diesel's main long-term liability on short trips. For pure reliability with the simplest mechanical footprint, B58 has the edge.
The B58's reputation is real but not absolute: confirmed recurring issues include the oil filter housing gasket (leaks around 100,000–160,000 km), water pump failures, and a plastic-component oil pump specific to engines built roughly 2019–2021 that BMW later revised to an all-metal part. None of these are catastrophic if caught early — they're exactly what a pre-purchase inspection should be checking for.
The real risk: xDrive transfer case
Active US class-action lawsuit — take this seriously
BMW is facing a class-action lawsuit (Sangenito et al. v. BMW of North America) alleging a defective transfer-case clutch causing shuddering and jerking, especially in turns at low speed, across xDrive models from model years 2019–2025, explicitly including the X5 (G05). Plaintiffs allege BMW knew of the issue since 2018/2020 and issued a service bulletin (SIB 20 02 20) in 2020 instructing dealers to replace the transfer-case fluid — a fix many owners say didn't resolve the problem long-term. Reported repair costs range from $250–1,300 for a fluid service up to $7,000–13,000 for a full replacement. Mismatched tire tread depth (more than roughly 2mm difference between axles) is the most commonly cited accelerant — always check that all four tires match in brand and wear.
Air suspension and the PHEV versions
Air suspension (rear or four-corner, depending on trim) improves ride quality noticeably but is a genuine wear item: rubber air springs typically start failing around 6–10 years or 60,000–90,000 miles, and a leaking spring left unaddressed can burn out the compressor too. If you want the lowest-risk used G05, standard steel suspension is the safer pick.
The xDrive45e/50e plug-in hybrids only make sense for buyers with reliable home charging and short commutes. On a depleted battery, real-world fuel economy (9–11 L/100km) is comparable to or worse than a plain xDrive40i, because you're hauling roughly 260 kg of extra battery weight for no benefit. One documented case describes a dealer quoting $70,000–75,000 to replace a failed HV battery on a 2021 xDrive45e — an extreme, unusual case, but a real illustration of the tail risk on an out-of-warranty PHEV.
Most common problems
| Problem | How common | Severity |
|---|---|---|
| xDrive transfer case shudder (class action) | Documented, litigated | High |
| B58 oil pump (2019–2021 engines) | Confirmed, well documented | High |
| B58 oil filter housing / water pump leaks | Common at 100,000+ km | Medium |
| B57 EGR cooler / DPF (short-trip use) | Common | Medium |
| Air suspension sag / compressor wear | Common with age | Medium-High |
| N63/S63 V8 oil consumption/leaks | Moderate, family trait | Medium-High |
| 48V starter-generator faults | Occasional, subject to a recall | Medium |
| Panoramic sunroof drain clogging | Common | Low (usually just a clean-out) |
Best model years
2020 is the most-recommended year among owners — the last model year before the 2021–2022 global chip shortage forced BMW to delete features (soft-close doors, fog lights, power tailgate, Harman Kardon audio) from many cars. A well-equipped 2023 pre-LCI is the other strong pick if budget allows. Approach 2021–2022 cars with extra care and confirm exactly what equipment is actually fitted.
Pre-purchase checklist
Check the car's real history before the test drive
A ProVINCheck report reveals accident history, real mileage, and title type for a BMW X5 G05 by VIN — in minutes, before you spend time on an in-person inspection.
- Free VIN decode
- Recalls & complaints
- Paid history report
BMW X5 G05 pre-purchase checklist
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Which version should you buy
- 🥇 Best all-round: xDrive40i (B58) — the best balance of reliability, character, and running cost.
- 🥈 Best diesel: xDrive30d (B57) — proven, ideal for high annual mileage.
- 💰 Best value: a well-equipped 2020 or late pre-LCI 2023 xDrive40i.
- 🛡️ Lowest long-term risk: xDrive40i with clean service history and confirmed oil pump status if built 2019–2021.
Final verdict
7.5/10. The G05 is a genuine step up over its predecessor, and the engines that matter most (B58, B57) largely deserve their reputation. But the real risk isn't the engine — it's the transfer case and air suspension, both well-documented, both worth budgeting for. Buy with a full service history and a proper pre-purchase inspection, and the G05 can be a satisfying long-term ownership. Buy purely on a low asking price with no reserve for repairs, and you're taking on real, documented risk.
BMW X5 G05 — frequently asked questions
Sources
This is a condensed summary of a much more detailed research pass — official BMW data, NHTSA recall records, ADAC statistics, court filings (ClassAction.org, CarComplaints.com), and long-term owner reports from Bimmerpost. For the full breakdown by engine, model year, and system, combine this with an independent pre-purchase inspection and a VIN history check before buying.
For more on decoding a BMW X5's VIN specifically — where to find it and what it reveals about the generation and spec — see our BMW X Series VIN check page, which covers the X5 too. What the 5UX code at the start of an X5's VIN does and doesn't tell you, and how BMW's short VIN works, is on our BMW VIN check page.
