BMW S68B44 engine code explained
S68B44 is the full code for BMW's newest V8, the M Division development of the N63TU3 that arrived in 2022 in the X7 M60i and 760i, then the X5 and X6 M60i, the XM, the F95 / F96 X5 M and X6 M LCI and the G90 M5 hybrid. Every application carries the same S68B44T0 code with outputs from 523 to 577 bhp from the engine alone, plus electric assistance on the M5 and XM. It is a Phase 1 record: too new for a failure pattern.
Quick answer
The S68B44 is the 4.4-litre V8 twin-turbo M engine, 48V mild hybrid petrol of the BMW S68 family, built 2022-present. Bimmer.AI scores the family 8 / 10: one of the safest used BMW engines to buy. The tables below give every output tier and sticker letter BMW used on this stem and which cars got them; the failure table is the same one that powers the S68 family guide.
How to read S68B44
| Part of the code | Meaning |
|---|---|
| S | BMW M GmbH (M Division) engine |
| 68 | engine family number within the S-series |
| B | petrol, longitudinal (rear-drive platform: 1 to 8 Series, X3 to X7, Z4) |
| 44 | displacement in tenths of a litre: 4.4 litres |
| K / U / M / O / T / S + digit | output tier and revision, appended in BMW's internal naming (for example S68B44O1) |
| A / B / C / D | parts-catalogue engine version printed on the engine cover sticker (for example S68B44A) |
S68B44 output tiers and which cars have them
| Code | Output | Cars | Notes |
|---|---|---|---|
| S68B44T0 | 523 bhp (M60i, 760i, XM base engine), 577 bhp (M5 G90 and XM Label engine side, 717 bhp system) | X5 M60i and X6 M60i (G05 / G06 LCI 2023 on), X7 M60i (G07 LCI), 760i xDrive (G70), XM (G09), X5 M and X6 M Competition (F95 / F96 LCI 2024 on), M5 (G90 / G99 2024 on) | One code; 48V mild hybrid on the M60i cars, plug-in hybrid on M5 and XM |
S68B44 sticker letters: S68B44A
Nothing buyer-relevant in the letter yet. Almost every S68 car is inside the BMW warranty. The inherited items are the hot-V coolant-pipe design and battery cycling from the N63 / S63 line, the aluminium charge-pipe upgrade on tuned cars, and the 48V starter-generator on the M60i models.
| Sticker code | What it denotes |
|---|---|
| S68B44A | Standard parts-catalogue version across all current applications. |
Known problems on every S68B44
Failure data is held once, per engine family, so this table is identical to the BMW S68 guide. Cost ranges are indicative UK figures.
| Failure mode | Severity | Frequency | Typical onset | UK repair range |
|---|---|---|---|---|
| 48V mild-hybrid starter-generator (inherited pattern) | Moderate | Uncommon | 30 to 80k mi | £1,000 to £2,200 |
| Charge pipe (carried over from N63 / S63 pattern) | Moderate | Uncommon | 40 to 100k mi | £200 to £500 |
| Coolant system inspection (V8 hot-V pattern) | Moderate | Uncommon | 80 to 150k mi | Free (recall) or up to £3,500 |
Long-term verdict
Phase 1 record. The S68 is BMW's latest M V8 and has only been in volume production since 2022. No catastrophic systemic failures documented to date; reliability picture is still emerging. The 48V mild-hybrid system carries the same BSG wear concerns as the B47 / B48 / B57 / B58 mild-hybrid implementations. Long-tail picture will sharpen materially over 2026-2030 as the fleet ages. Most S68 cars in 2026 are still under warranty.
Check a specific S68B44 listing
Paste any BMW S68 listing, VIN or registration. Bimmer.AI identifies the exact engine and returns the buyer report in 30 seconds.
Run a Bimmer.AI buyer report →Bimmer.AI is designed to help you identify BMW-specific buyer risks before you travel, negotiate, or pay for an inspection. It does not replace a physical inspection by a qualified mechanic, a legal vehicle-history check (e.g. HPI Check), or independent verification of finance, stolen, or write-off status. Repair-cost ranges are indicative UK figures that vary by region, specialist, parts supply, and labour rates.
Frequently asked questions
Is the S68B44 just an N63?
It is a development of the N63TU3 rather than a clean-sheet engine: same 4.4-litre hot-V architecture, new pistons and crank, revised turbos and cooling, a reinforced block for the M applications, and the 48V mild-hybrid system. BMW uses it across both the M Performance (M60i) and full M (M5, X5 M) ranges, which is new; the S63 was M-only.
Does the G90 M5 use the S68B44?
Yes. The G90 M5 saloon and G99 M5 Touring use the S68B44T0 at 577 bhp with a 194 bhp electric motor in the gearbox for 717 bhp combined. It is a plug-in hybrid with around 40 miles of electric range. The XM uses the same engine and motor combination.
Which BMWs have the S68B44 engine?
The S68B44 went into the following cars, by output tier. S68B44T0 (523 bhp (M60i, 760i, XM base engine), 577 bhp (M5 G90 and XM Label engine side, 717 bhp system)): X5 M60i and X6 M60i (G05 / G06 LCI 2023 on), X7 M60i (G07 LCI), 760i xDrive (G70), XM (G09), X5 M and X6 M Competition (F95 / F96 LCI 2024 on), M5 (G90 / G99 2024 on). The two-letter family badge is S68; any listing that quotes the family code is talking about one of these.
Is the BMW S68B44 reliable?
Bimmer.AI scores the S68 family 8 out of 10, which makes the S68B44 one of the safest used BMW engines to buy. Phase 1 record. The S68 is BMW's latest M V8 and has only been in volume production since 2022. No catastrophic systemic failures documented to date; reliability picture is still emerging. The 48V mild-hybrid system carries the same BSG wear concerns as the B47 / B48 / B57 / B58 mild-hybrid implementations. Long-tail picture will sharpen materially over 2026-2030 as the fleet ages. Most S68 cars in 2026 are still under warranty.
What does S68B44 mean?
S is the BMW M GmbH (M Division) engine, 68 is the family number, B means petrol, longitudinal (rear-drive platform: 1 to 8 Series, X3 to X7, Z4), and 44 is the displacement in tenths of a litre (4.4 litres). BMW appends an output tier and revision (K, U, M, O, T or S plus a digit) in its own naming, and the parts catalogue adds a version letter (A, B, C) that is what you see on the engine cover.