2009 Mercedes-Benz S550 Road Test Specs | Edmunds

2009 Mercedes-Benz S-Class - Road Test Specs

2009 Mercedes-Benz S-Class Sedan

(5.5L V8 7-speed Automatic)


Model year2009
StyleS550 4dr Sedan (5.5L 8cyl 7A)
Base MSRP$90,225
Options on test vehicleSport Package ($5,690 -- includes 19-inch AMG five-spoke wheels, sport body styling); Premium Package ($4,990 -- includes rearview camera, Parktronic, Keyless Go, Drive-Dynamic multicontour front seats with massage feature, Night View Assist); Active Body Control ($3,960); Distronic Plus Package ($2,880 --includes Distronic Plus with Parking Guidance and Blind Spot Assist); Savanna/Cashmere Premium Leather ($1,330); Panorama Sunroof ($1,050); iPod Integration Kit ($425)
As-tested MSRP$111,550


Drive typeRear-wheel drive
Engine typeV8
Displacement (cc/cu-in)5,461cc (333 cu-in)
Block/head materialAluminum/aluminum
ValvetrainDouble overhead camshaft
Compression ratio (x:1)10.7
Redline (rpm)6,500
Horsepower (hp @ rpm)382 @ 6,000
Torque (lb-ft @ rpm)391 @ 2,800
Transmission typeSeven-speed automatic
Transmission and axle ratios (x:1)I=4.38; II=2.86; III=1.92; IV=1.37; V=1.00; VI=0.82; VII=0.73; R=3.42; R2(winter mode)=2.23; Final=2.65


Suspension, frontMultilink
Suspension, rearMultilink
Steering typeSpeed-proportional power steering
Steering ratio (x:1)17.83:1
Tire brandContinental
Tire modelSportContact 2
Tire typeAll-season
Tire size, front255/45R19 100Y
Tire size, rear275/45R19 101Y
Wheel size19-by-8.5 inches front -- 19-by-9.5 inches rear
Wheel materialAlloy
Brakes, frontVentilated disc
Brakes, rearVentilated disc

Track Test Results

0-45 mph (sec.)3.8
0-60 mph (sec.)5.7
0-75 mph (sec.)8.2
1/4-mile (sec. @ mph)13.9@101.0
0-60 with 1 foot of rollout (sec.)5.4
Braking, 30-0 mph (ft.)27
60-0 mph (ft.)108
Slalom, 6 x 100 ft. (mph)SC OFF=63.0; SC ON=63.4
Skid pad, 200-ft. diameter (lateral g)SC OFF=0.87; SC ON=0.87
Sound level @ idle (dB)44.0
@ Full throttle (dB)76.5
@ 70 mph cruise (dB)64.4

Test Driver Ratings & Comments

Acceleration commentsResponds well to brake-torque but not too much wheelspin. Smooth linear power delivery, with an aggressive exhaust note. Shifts are buttery smooth, but not very quick.
Braking ratingExcellent
Braking commentsCrazy-powerful brakes that don't fade a bit. Very little dive but the pedal is a little soft (always). Belt cinches tightly when ABS engages.
Handling ratingVery Good
Handling commentsIn both skid pad and slalom tests, I couldn't detect a bit of difference with ESP on or off. Also, the Active Body Control is very strange, but works amazingly well -- keeping all four tires firmly planted on the ground. ABC in the skid pad means zero body roll. Very slight corrections from ESP keep it spot-on in the circle. Steering feels a tad light. On the slalom course, ABC leans the car INTO the turn like a slalom skier. Strange! In the end, ABC and ESP made every run highly repeatable and easy-peasy. Same speed with ESP off or on.

Testing Conditions

Elevation (ft.)1,121
Temperature (°F)67.75
Wind (mph, direction)1.5 west

Fuel Consumption

EPA fuel economy (mpg)14 city/22 highway
Fuel tank capacity (U.S. gal.)23.8

Dimensions & Capacities

Curb weight, mfr. claim (lbs.)4,465
Curb weight, as tested (lbs.)4,630
Weight distribution, as tested, f/r (%)52.6/47.4
Length (in.)205.0
Width (in.)73.7
Height (in.)58.0
Wheelbase (in.)124.6
Track, front (in.)63.1
Track, rear (in.)63.2
Turning circle (ft.)40.0
Legroom, front (in.)41.9
Legroom, rear (in.)42.3
Headroom, front (in.)37.8
Headroom, rear (in.)38.5
Shoulder room, front (in.)59.1
Shoulder room, rear (in.)58.7
Seating capacity5
Cargo volume (cu-ft)16.3
Max. cargo volume, seats folded (cu-ft)16.3


Bumper-to-bumper4 years/50,000 miles
Powertrain4 years/50,000 miles
Corrosion4 years/50,000 miles
Roadside assistanceUnlimited
Free scheduled maintenanceUnlimited years/3,000 miles


Front airbagsStandard
Side airbagsStandard dual front and dual rear
Head airbagsStandard front and rear
Knee airbagsNot available
Antilock brakesFour-wheel ABS
Electronic brake enhancementsBraking assist, electronic brakeforce distribution
Traction controlStandard
Stability controlStandard
Rollover protectionStandard
Tire-pressure monitoring systemTire-pressure monitoring
Emergency assistance systemPre-collision safety system
NHTSA crash test, driverNot tested
NHTSA crash test, passengerNot tested
NHTSA crash test, side frontNot tested
NHTSA crash test, side rearNot tested
NHTSA rollover resistanceNot tested

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