BMW M5 Vs Mercedes-AMG E63 S: 2025 Supersaloon Verdict

The rivalry between BMW’s M Division and Mercedes-AMG’s performance arm has produced some of the most exhilarating executive saloons ever built. In this comprehensive face-off, we dive deep into the BMW M5 Competition and Mercedes-AMG E63 S, two twin-turbo V8 monsters that blend blistering speed, advanced all-wheel-drive systems, and surprising refinement. Both cars deliver over 600 horsepower, but which one edges ahead in straight-line acceleration, cornering dynamics, daily drivability, and value? We’ll break it down across key categories using real-world data and expert insights.

Powertrain and Performance Specs at a Glance

At the heart of these beasts lie hand-built twin-turbo V8 engines designed for explosive output. The BMW M5 Competition’s 4.4-liter unit produces 616 bhp at 6,000 rpm and 553 lb ft of torque from 1,800 to 5,860 rpm, paired with an eight-speed automatic and M xDrive AWD. The Mercedes-AMG E63 S counters with a smaller 4.0-liter V8 making 604 bhp between 5,750 and 6,500 rpm, but it boasts a massive 627 lb ft from 2,500 to 4,500 rpm, also through a nine-speed automatic and 4Matic+ AWD.

Power-to-weight favors the M5 slightly at 330 bhp per ton versus the E63 S’s 317 bhp/ton, thanks to the BMW’s lighter 1,895 kg curb weight compared to 1,935 kg. Official 0-62 mph times are neck-and-neck: 3.3 seconds for the M5 and 3.4 for the E63 S, with top speeds limited to 155 mph (M5) and 186 mph (E63 S). Real-world tests reveal even closer margins, with measured power at 671 ps (662 bhp) for the M5 and 645 ps (636 bhp) for the E63 S.

This table highlights the E63 S’s torque advantage, ideal for mid-range pulls, while the M5’s extra power shines at higher revs.

Straight-Line Acceleration: Drag Strip Dominance

Both cars launch with ferocious intent, but instrumented tests paint a nuanced picture. From 0-30 mph, they’re tied at 1.1 seconds, but the M5 pulls ahead to 40 mph in 1.6 seconds versus the E63 S’s 1.7. By 0-100 kph (62 mph), the BMW edges it with consistent sub-3.5-second runs in drag races. Rolling acceleration from 60-100 kph is identical at 2.3 seconds in fourth gear, showing their gearboxes’ lightning shifts.

In quarter-mile sprints, the M5 often records times around 11 seconds, benefiting from its rear-biased AWD in drift mode. The E63 S, with more torque, feels brutally strong from a standstill but can suffer slight wheelspin on its Michelin Pilot Sport 4S tires. Braking is another M5 strong suit: 100 kph to 0 in 30 meters versus the Mercedes’ 32 meters. Overall straight-line scores favor the BMW 100 to 92.

• Key Insight: M5 excels in repeatable launches without launch control in some tests.
• E63 S torque surge overwhelms in highway overtakes.
• Both top 190 mph in unrestricted form.

Handling and Dynamics: Track and Twisties

On twisty roads or circuits, the M5’s sharper steering and responsive chassis give it an edge. Its M xDrive system allows full rear-wheel drive for playful slides, feeling more connected and less ‘blind’ than the E63 S’s setup. The BMW’s pedals are progressive, front tires bite harder, and it changes direction with agility despite its size.

The E63 S counters with superior grip from its 4Matic+ (up to 100% rear torque bias) and air suspension, which remains composed even in Race mode—more absorbent than the M5’s Comfort setting. However, its steering lacks the M5’s precision, and it’s less forgiving of mid-corner bumps. Lateral acceleration is near-identical at 1.00-1.01 g. Track performance ties at 100 points each, but the M5 feels more engaging.

Full 0-100-0 mph braking-to-acceleration cycles favor the M5 at 11.0 seconds over 12.6, underlining its balanced poise.

Ride Quality and Everyday Usability

These aren’t just track tools; they’re grand tourers. The E63 S’s adaptive air springs excel in Comfort, ironing out imperfections better than the M5’s firmer adaptive dampers. It’s quieter at cruise, with a plusher cabin for long hauls. The M5, while compliant, transmits more road noise and feels sportier overall—keener to ‘knuckle down’.

All-wheel drive makes both winter-friendly, but the M5’s drift mode adds fun. Fuel economy hovers around 20-25 mpg combined, with the nine-speed Mercedes slightly thriftier on motorways.

Interior, Tech, and Practicality

Both boast lavish cabins with carbon trim, heated/ventilated seats, and massive infotainment screens. The M5’s iDrive is intuitive with a haptic controller; the E63 S’s MBUX voice system responds to ‘Hey Mercedes’ commands flawlessly. Boot space is generous (M5: 530 liters; E63 S: 540 liters), and rear legroom suits adults.

Mercedes edges luxury with softer materials; BMW wins driver focus with physical buttons and head-up display. Safety suites include adaptive cruise, lane-keeping, and 360 cameras on both.

Pricing, Ownership, and Value

Starting at £96,565, the E63 S undercuts the M5’s £102,325, but options inflate both past £120,000. Residuals favor BMW slightly, with five-year servicing around £2,500. AMG’s V8 has a thirstier reputation, but real-world costs are similar.

Which One Wins?

The BMW M5 Competition takes a narrow victory for its superior handling, acceleration repeatability, and engaging drive—ideal for enthusiasts. The Mercedes-AMG E63 S fights back with torque, ride comfort, and value, suiting those prioritizing luxury. It’s a deadlock at the top, but the M5’s agility tips the scales.

Frequently Asked Questions (FAQs)

What is the fastest accelerating car between BMW M5 and E63 S?
The M5 edges ahead in 0-62 mph and quarter-mile tests.

Which has better handling?
BMW M5, thanks to sharper steering and playful AWD.

Are they reliable?
Both score well, but BMW’s M service network is extensive.

Can they drift?
Yes, both offer rear-drive modes for slides.

Which is cheaper to run?
E63 S has a slight edge in base price and efficiency.