M850i G15 facelift
2023 to 2026 · reliability 68 to 70- Valve stem seals (older or tracked)Medium$4,000
- Oil and coolant leaks (hot vee)Medium$1,500
- Cooling system loadMedium$1,500
Problems by generation
BMW M850i problems by generation
The known problems on all 4 M850i generations in our guide (G14, G15, G14 facelift and G15 facelift): what a fix costs, how each one scores on reliability, and which model years to skip.
Every M850i generation at a glance
| Generation | Reliability | Costliest known repair | Best year |
|---|---|---|---|
| M850i G15 facelift2023 to 2026 | 68 to 70Good | Valve stem seals$4,000 | 2026Score 57 |
| M850i G14 facelift2023 to 2026 | 68 to 70Good | Valve stem seals$4,000 | 2026Score 54 |
| M850i G152019 to 2022 | 66 to 67Moderate | Valve stem seals$4,000 | 2022Score 57 |
| M850i G142019 to 2022 | 66 to 67Moderate | Valve stem seals$4,000 | 2022Score 53 |
Reliability is out of 100, for the range of a generation's model years: its engine, its own known problems and their bills, parts and service costs, and age. Repair figures are the guides' estimates for an independent shop, not quotes. How the scores work
The worst known problems on each M850i
M850i G14 facelift
2023 to 2026 · reliability 68 to 70- Valve stem seals (older or tracked)Medium$4,000
- Oil and coolant leaks (hot vee)Medium$1,500
- Cooling system loadMedium$1,500
M850i G15
2019 to 2022 · reliability 66 to 67- Valve stem seals (older or tracked)Medium$4,000
- Oil and coolant leaks (hot vee)Medium$1,500
- Cooling system loadMedium$1,500
M850i G14
2019 to 2022 · reliability 66 to 67- Valve stem seals (older or tracked)Medium$4,000
- Oil and coolant leaks (hot vee)Medium$1,500
- Cooling system loadMedium$1,500
Worst first: severity, then the repair estimate. Recalls are left out, since a BMW dealer fixes them free.
Which M850i years to skip
| Generation | Best year | Weaker years, and why |
|---|---|---|
| M850i G15 facelift2023 to 2026 | 2026 (57) | None: no year is held back by a specific problem. |
| M850i G14 facelift2023 to 2026 | 2026 (54) | None: no year is held back by a specific problem. |
| M850i G152019 to 2022 | 2022 (57) | 2019 to 2021 (Guide Score 56 to 57) score close to the best, but check for fuel injectors corroded by coolant. |
| M850i G142019 to 2022 | 2022 (53) | 2019 to 2021 (Guide Score 52 to 53) score close to the best, but check for fuel injectors corroded by coolant. |
Most of the gap between years is age. A year is listed when the score charges it for something specific: a different engine, a problem that hit only some years, or a gearbox that came later. The same list for every car is on the best and worst years.
Before you choose
Tip
A well-kept car from a weaker generation can be a better buy than a neglected one from the best. Each guide has the full problem list with how to check for each, and Score a listing rates one car for sale.
Head to head