| Length | 4,506 mm | 4,657 mm | 4,873 mm (incl. tailgate spare) | C longest · +367 mm on A, +216 mm on B |
| Width | 1,924 mm | 2,110 mm (rear arches) | 2,084 mm (Widestar flares) | B widest at the arches · C +100 mm on its 1,984 mm body |
| Height | 1,165 mm | 1,241 mm (−35 mm springs) | 1,966 mm | C stands ~0.8 m over both · optional RideControl −45 mm |
| Wheelbase | 2,620 mm | 2,720 mm | 2,890 mm | C +270 mm on A, +170 mm on B |
| Engine & layout | 5.2 L V10 · mid-rear · 640 PS | 6.5 L V12 · front-mid · 840 PS | 4.0 L V8 biturbo · front · 800 PS | C the only turbocharged, front-engined, ladder-frame vehicle of the three |
| Drive | AWD | RWD · 4WS | AWD 40:60 · 9-spd · 3 locks · low range | A and C AWD · B alone RWD |
| Dry weight | 1,382 kg | 1,525 kg (base) | 2,485 kg kerb (stock G 63) | C quoted at kerb weight · Brabus 800 kerb unpublished · ≈ +1.0 to 1.1 t on A/B |
| Tyres | 245/30 R20 · 305/30 R20 | 275/30 R21 · 335/25 R22 | 305/35 R23 · 305/35 R23 | C 35-series carries ~107 mm of sidewall vs B’s ~84 mm |
| Keyless | 125 kHz LF · relayable | Keyless start · 125 kHz LF · 433 MHz fob | Keyless-Go entry + start · 125 kHz LF · 433 MHz fob | Relay opens and starts C · only inside the key’s ~2 min awake window |
| Factory telematics | None (2017 to 2019) | None (2017 to 2020) | LTE module · Mercedes me connect (MY2019+) | C carries a factory uplink · remote unlock and live tracking |
| OBD-II location | Under dash · door aperture | Under dash · OBD bracket | Under dash · driver footwell | Parity on placement · FBS4 blocks OBD key programming on C |
| Tracker fit | Covert aftermarket unit | Covert aftermarket unit · Thatcham S5 | Covert aftermarket unit · Thatcham S5 | Parity · C’s factory Vehicle Tracker shares the LTE module a thief pulls first |