2009 Mercedes-Benz SLK-Class SLK55 AMG Road Test Specs | Edmunds

2009 Mercedes-Benz SLK-Class - Road Test Specs

2009 Mercedes-Benz SLK-Class Convertible

(5.4L V8 7-speed Automatic)


Model year2009
StyleSLK55 AMG 2dr Convertible (5.4L 8cyl 7A)
Base MSRP$65,700
Options on test vehicleDigital Dual-Zone Climate Control, Heating Package, Multimedia Package, Metallic Paint, Lighting Package
As-tested MSRP$72,545


Drive typeRear-wheel drive
Engine typeV8
Displacement (cc/cu-in)5,439cc (332 cu-in)
Block/head materialAluminum
ValvetrainSingle overhead camshaft
Compression ratio (x:1)11.0
Redline (rpm)6,600
Horsepower (hp @ rpm)355 @ 5,750
Torque (lb-ft @ rpm)376 @ 4,000
Transmission type7-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; Final Drive=3.06:1


Suspension, frontMacPherson strut
Suspension, rearMultilink
Steering typeSpeed-proportional power steering
Steering ratio (x:1)Variable
Tire brandPirelli
Tire modelP Zero Rosso MO
Tire typePerformance
Tire size, front245/40ZR18 Z
Tire size, rear245/35ZR18 Z
Wheel size18-by-7.5 inches front -- 18-by-8.5 inches rear
Wheel materialAlloy
Brakes, frontVentilated disc
Brakes, rearVentilated disc

Track Test Results

0-45 mph (sec.)3.3
0-60 mph (sec.)4.9
0-75 mph (sec.)6.8
1/4-mile (sec. @ mph)13.0 @ 108.8
0-60 with 1 foot of rollout (sec.)4.6
Braking, 30-0 mph (ft.)29
60-0 mph (ft.)115
Slalom, 6 x 100 ft. (mph)66.2
Skid pad, 200-ft. diameter (lateral g)0.87
Sound level @ idle (dB)48.4
@ Full throttle (dB)80.3
@ 70 mph cruise (dB)69.1

Test Driver Ratings & Comments

Acceleration commentsWith ESP on, the traction control does an admirable job of containing the power (brake check PLUS torque reduction?). Shutting it off in "Drive Sport" ushered a 1-2 short-shift at the first hint of wheelspin. Had to resort to manual mode to achieve a decent launch, but then the slow tach (and I.P. that flashes red to signal upshift) had it hitting the rev limiter. Difficult, though not impossible, to get under 5 seconds to 60. Upshifts are sometimes slow/fast or smooth/harsh, and I cannot determine why.
Braking ratingExcellent
Braking commentsExcellent brake power and fade resistance. Near-zero dive and pedal always felt trustworthy. Autobahn brakes.
Handling ratingVery Good
Handling commentsSkid pad: The very definition of "pushy-loose" where it understeers on throttle and snaps into oversteer when you jump out. Tenuous at best and dangerous at worst with ESP off in manual mode. Slalom: As on the skid pad, the SLK55 can be a handful in the slalom with ESP off in manual mode. That said, turn-in is crisp up to nine-tenths, then starts to understeer. Throttle response is terrific, so a slide at the end is easily requested, but the short wheelbase makes it tricky to control. The P Zeros step off pretty abruptly, then slide predictably. This is how I imagine a V8 Monster Miata would feel.

Testing Conditions

Elevation (ft.)1,121
Temperature (°F)51
Wind (mph, direction)N/A

Fuel Consumption

EPA fuel economy (mpg)14 city/22 highway
Edmunds observed (mpg)17.1
Fuel tank capacity (U.S. gal.)18.5

Dimensions & Capacities

Curb weight, mfr. claim (lbs.)3,472
Curb weight, as tested (lbs.)3,474
Weight distribution, as tested, f/r (%)50/50
Length (in.)161.5
Width (in.)70.6
Height (in.)50.0
Wheelbase (in.)95.7
Track, front (in.)60.0
Track, rear (in.)61.0
Turning circle (ft.)34.5
Legroom, front (in.)42.5
Headroom, front (in.)37.9
Shoulder room, front (in.)52.2
Seating capacity2
Cargo volume (cu-ft)9.8
Max. cargo volume, seats folded (cu-ft)9.8


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 with head protection chambers
Head airbagsNot available
Knee airbagsDual front
Antilock brakes4-wheel ABS
Electronic brake enhancementsBraking assist, electronic brakeforce distribution
Traction controlStandard
Stability controlStandard
Tire-pressure monitoring systemTire-pressure monitoring
Emergency assistance systemNot available
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

New Car Buying Guides

See which cars and trucks our editors recommend