The BMW SMG3, formally the 7-Speed SMG III, was BMW M's most ambitious automated manual gearbox, developed specifically to harness the ferocious 5.0-liter S85 V10 in the E60 M5 and E63/E64 M6. Produced from 2005 to 2010, it represented the final and most sophisticated evolution of BMW's Sequential Manual Gearbox concept before the M division transitioned to dual-clutch technology.
What the SMG3 Is and How It Works
The SMG3 is not a torque-converter automatic. At its core sits a conventional manual gearbox—complete with clutch and gearsets—but the clutch actuation and gear selection are handled by a high-pressure electrohydraulic system rather than a driver-operated pedal and lever. A dedicated hydraulic pump and accumulator drive the actuators that engage the single dry clutch and shift the gears, all commanded by paddles behind the steering wheel or the console selector.
Because it uses a single clutch, the SMG3 must interrupt torque during each shift, unlike the later dual-clutch designs. To compensate, M engineers gave it a legendary Drivelogic system, offering eleven shift programs across the S mode range plus fully automatic settings—allowing everything from smooth commuting to brutally fast, launch-control-assisted upshifts.
Gear Count and Behavior
The SMG3 added a seventh forward ratio compared with its six-speed predecessors, giving the high-revving V10 both a punchy first gear and relaxed cruising gearing. At its most aggressive Drivelogic setting the SMG3 fires off shifts in a fraction of a second, delivering the head-snapping character that made these M cars so memorable. In gentler modes, however, the single-clutch architecture can feel jerky at low speeds—a trait owners quickly learn to manage with throttle timing.
Which BMWs Used It
The SMG3 was reserved for the flagship V10 M cars built around the S85 engine—the E60 M5 sedan and the E63/E64 M6 coupe and convertible. You can confirm exactly which gearbox and driveline your car left the factory with using our VIN decoder, and explore the broader M lineage through the BMW DNA archive. Buyers cross-shopping era M cars should note that many were also offered with a true six-speed GS6 manual.
Reliability, Servicing, and Ownership
The SMG3 demands respect and proper maintenance:
- Hydraulics: The pump and accumulator are the heart of the system and can be costly if neglected.
- Clutch wear: As a single dry clutch, it wears like a manual, and low-speed driving style directly affects longevity.
- Fluid service: Regular SMG hydraulic fluid changes are essential to reliable actuation.
The SMG3 was ultimately succeeded by BMW's dual-clutch DCT7 (also cataloged as DKG), which eliminated torque interruption entirely. For enthusiasts, though, the SMG3 remains an evocative link to the last naturally aspirated M V10.