Thin-Data Summary
Thin-Data Fallback mode — one paragraph: The G90 and G99 M5 are powered exclusively by the S68B44A plug-in hybrid V8 powertrain. This 4.4-litre twin-turbo unit produces 577 hp from the combustion engine alone, supplemented by a 194 hp electric motor for a total system output of 727 PS (717 hp) and 1,000 Nm of torque. The S68 is a significant evolution over the S63 it replaces, with the electric motor integrated into the eight-speed automatic transmission. The M5 saloon (G90) accelerates from 0-60 mph in 3.4 seconds; the Touring (G99) follows at 3.5 seconds. The powertrain is praised for its effortless power delivery and duality — silent EV mode for commuting, brutal V8 performance when provoked. However, the plug-in hybrid system adds approximately 400 kg (882 lbs) of weight, bringing the saloon to 2,435 kg and the Touring to 2,475–2,508 kg. The S68 is a new engine, so long-term reliability data is limited — but early indications suggest it's robust, with the main concerns being the complexity of the hybrid system and the sheer weight's impact on component wear. For most buyers, the G90 saloon offers the purest M5 experience; the G99 Touring offers unmatched practicality without sacrificing performance.
