2003-2008 Mercedes-Benz SL-Class: Full Review
Updated: 11/23/08
2008 Mercedes-Benz SL-Class
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2003-2008 Mercedes-Benz SL-Class ▼
- Price Range: $32,100 - $131,100
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Learn about the year-to-year changes and reliability for the 2003-2008 Mercedes-Benz SL-Class and our price chart details a range of prices based on vehicle mileage and condition.
Pros
- Acceleration
- Seat comfort
- Build quality
- Steering/handling
Cons
- Instruments/controls
- Brake-pedal feel
Vehicle Highlights
A redesigned SL500 bowed as an early 2003 model. Soon, it was followed by an SL55 AMG version with styling, chassis, and powertrain modifications by Mercedes' in-house performance team. These two-seat rear-drive convertibles were slightly longer, lower, and wider than the 1990-2002 models. Yet, they were some 125 pounds lighter. A retractable metal hardtop replaced the prior cloth folding top. The SL500 retained a 5.0-liter V8, but the SL55's 5.4-liter V8 was newly supercharged for an extra 104 horsepower over the previous engine. Both SLs had a five-speed automatic transmission with manual shift feature. The SL55 used a special "SpeedShift" unit with performance programming and steering-wheel shift buttons. Both models came with an traction/antiskid control and Mercedes' ABC active suspension, designed to reduce cornering lean. A shared industry-first was antilock four-wheel disc brakes with "brake-by-wire" technology that modulated hydraulic pressure to each wheel by computer signals. Both SLs also came with head/torso side airbags, a driver knee airbag, and a rollover bar that popped up if sensors detected an impending tip. Additional standard equipment included navigation and assistance systems, and a second battery mounted in the trunk to run power accessories. The SL55 had 18-inch wheels instead of 17s, plus higher-speed low-profile tires that were wider at the rear than at the front. Options for both SLs included a tire-pressure monitor; high/low-beam xenon headlamps; radar cruise control designed to maintain a set following distance; and ventilated/massaging seats. Mercedes' available Keyless Go system used a credit-card-sized transmitter for unlocking and starting the car simply by touch. Voice control for audio, phone, and other functions was available through dealers. Two-passenger competitors included the Cadillac XLR and Lexus SC 430.
Expert Ratings Summary (view detailed report)
| Category | Mercedes-Benz SL-Class SL500 Rating | |
|---|---|---|
| Performance | 7 | |
| Fuel Economy | 4 | |
| Ride Quality | 6 | |
| Steering/Handling/Braking | 8 | |
| Quietness | 6 | |
| Controls/Materials | 7 | |
| Interior Room | 8 | |
| Cargo Capacity | 2 | |
| Value within Class | 6 | |
| Total Score: | 54 |
Learn about the year-to-year changes of the 2003-2008 Mercedes-Benz SL-Class. Get full details of the styling and performance changes throughout the history of the 2003-2008 Mercedes-Benz SL-Class.
Year to Year Changes
2004 Mercedes-Benz SL-Class:
A 12-cylinder SL600 flagship model debuted for 2004, along with a seven-speed automatic transmission. Installed only in the SL500, the seven-speed was an industry first. During up and down shifts, it could skip gears for increased efficiency. Other models retained Mercedes' five-speed automatic. All models were now pre-wired for optional dealer-installed satellite radio. The Keyless Go option now took its signal from a keyboard instead of a pass card.
2005 Mercedes-Benz SL-Class:
For 2005, the navigation system and center console were revised. A new limited-production SL65 AMG model was launched, with a 604-horsepower, twin-turbo V-12 engine. In addition to specific styling touches, the SL65 AMG got bigger brakes and 19-inch wheels. The revamped console included an updated version of Mercedes' COMAND video control for navigation, audio, and climate functions.
2006 Mercedes-Benz SL-Class:
Keyless Go, a keyless-entry and starting system, became standard on SL600 and SL65 models, but remained optional for the SL500 and SL55. Run-flat tires now were available for SL500/600 models. Satellite radio joined the options list. The high-performance SL55 AMG could be equipped with a $14,000 AMG Performance Package that included exclusive interior trim and a 186-mph top-speed governor (others were limited to 155 mph).
2007 Mercedes-Benz SL-Class:
New for 2007 was the SL550. It replaced the SL500 and had a 382-hp V8 vs. 302 hp.
2008 Mercedes-Benz SL-Class:
The 2008 Mercedes-Benz SL-Class got no major changes.
Our road test for the 2003-2008 Mercedes-Benz SL-Class includes a full evaluation from the inside out. We've evaluated every aspect of the 2003-2008 Mercedes-Benz SL-Class and highlighted the vehicle's performance with pros and cons. Use our comprehensive road test ratings to decide if this generation 2003-2008 Mercedes-Benz SL-Class is right for you.
Consumer Guide® Road-Test Evaluation
Although the SL500 isn't as fast off the line as might be expected, it gathers speed quickly and shows true authority above 40 mph. Mercedes' 6.1-second claim for 0-60-mph acceleration seemed a trifle optimistic; our testers managed 6.5 seconds. With a claimed 4.5-second time, the SL55 was the fastest Mercedes yet. Until the SL65 arrived, that is, with a 4.2-second claim. The SL600 is strong both from a standstill and for highway passing. A test SL500 averaged 19.5 mpg in mostly highway driving, so expect less overall. Premium fuel is required. SL-Class models deliver a fine blend of firm control and astute bump absorption, though they're more jarring than expected on really rough pavement. Even top-down, the impressively solid SL holds quivers to a minimum. Handling is nowhere near Porsche-nimble, yet the SL offers fine balance in turns with natural steering feel and good grip. Impressive high-speed stability rounds out the picture; 75 mph feels more like 40 mph. Stopping power is strong, but brake-by-wire furnishes inconsistent deceleration at around-town speeds. The brake pedal has slightly numb feel and, in simulated panic stops, excessive initial travel--but shorter-than-average stopping distances. Top-up, the SL is as quiet as most any luxury coupe, with little wind noise and almost no tire roar. Top-down, wind rush is well managed at highway speeds. The V8's rich purr is evident only during rapid acceleration. Engines are hushed at idle, and little louder at full throttle. Many buttons and switches dot the sporty, sophisticated dashboard, though all are easy to reach. Some testers have complained that pronounced coves failed to shield the speedometer and tachometer from daytime glare. The navigation system incorporates some audio and climate functions, and most adjustments require multiple inputs. Pop-out cupholders obscure the navigation screen and nearby conventional climate controls. The hardtop powers in and out of the trunk area in 16 seconds. High-grade materials and world-class finish are appropriate for this price level, but that's not true of the flimsy sunvisors and some plastic cabin trim. Stretch-out space is hard to fault on supportive and comfortable seats, though the low-slung body and long doors mean less-than-ideal entry/exit. Trunk space totals 10.2 cubic feet with the roof raised, 7.3 when it's lowered--enough for two small golf bags. The stowed top pivots for access to items in the trunk bottom. Cabin storage includes large map pockets and covered bins behind seats.
Value for the Money
Intriguingly engineered, the current SLs are solidly built, impeccably finished, and a pleasure to drive. Their style and cachet should stay fresh for years, boosting long-term resale values and taking some sting out of the startling new-car sticker prices. Of course, that's not good news for used-car shoppers, who can expect to plenty for a secondhand SL.
Intriguingly engineered, the current SLs are solidly built, impeccably finished, and a pleasure to drive. Their style and cachet should stay fresh for years, boosting long-term resale values and taking some sting out of the startling new-car sticker prices. Of course, that's not good news for used-car shoppers, who can expect to plenty for a secondhand SL.
Expert Ratings Summary
| Category | Mercedes-Benz SL-Class SL500 Rating | |
|---|---|---|
| Performance | 7 | |
| Fuel Economy | 4 | |
| Ride Quality | 6 | |
| Steering/Handling/Braking | 8 | |
| Quietness | 6 | |
| Controls/Materials | 7 | |
| Interior Room | 8 | |
| Cargo Capacity | 2 | |
| Value within Class | 6 | |
| Total Score: | 54 |
Each vehicle report contains one rating chart for representative model. Consumer
Guide® rates in ten key areas: Performance, Fuel Economy, Ride Comfort, Steering
and Handling, Interior Noise, Controls and Materials, Driver Room, Passenger Room,
Cargo Capacity, and Insurance Costs. These ratings compare the particular vehicle
rated to ALL other vehicles, not a vehicle's standing in a particular class. In the
ratings table, "1" is the lowest rating and "10" is the highest rating.
Our reliability study for this generation Mercedes-Benz SL-Class includes details on average repair costs, manufacturer recalls, and everything you need to know to gauge the long-term reliability of this generation Mercedes-Benz SL-Class .
Trouble Spots
Consumer Guide's® Auto Editors have scoured repair bulletins and questioned mechanics to search
for commonly occurring problems for a particular vehicle. In some cases we also give possible manufacturer-suggested
solutions. In many instances these trouble spots are Technical Service Bulletins posted by the manufacturer,
however, we have our own expert looking at additional vehicle problems.
Air conditioner:
The A/C compressor may cycle on and off too often due to a problem in the sensor for the emission control charcoal canister, sending an erroneous signal across the multiplex bus. (2003)
Ball joints:
Noises from the upper control arm caused by bad ball joint caused by torn rubber cover on joint. (2005-07)
Battery:
Poor battery charging may be due to a bad voltage regulator in the alternator. (2003)
Blower motor:
The blower motor may quit working after a minute or so, then work momentarily and quit again due to internal circuit breaker in blower regulator which must be replaced. (2005-06)
Brakes:
Some vehicles have rotors that warp under hard use, which creates heat. New rotors are heavier and withstand more heat. (2003)
Engine noise:
During hard acceleration, there is a noise from the engine that sounds like piston slap and the noise is eliminated by replacing the motor mounts. (2003)
None:
The automatic leveling system may allow the vehicle to lower after extended sitting (approx. a week) due to leak of check valve block(s). Drooping on only one corner is due to dirty hydraulic fluid, which must be replaced along with filter. (2005-06)
None:
Vehicle may lower randomly while driving due to problem with active suspension system due to problems with the body acceleration sensors. (2005)
Transmission leak:
Fluid may leak from the electrical connector of the automatic transmission. (2003)
Consumer Guide® Estimated Repair Costs
This table lists costs of likely repairs for comparison with other vehicles. The
dollar amount includes the cost of the part(s) and labor (based on $50 per hour) for the
typical repair without extras or add-ons. Like the pricing information, replacement
costs can vary widely depending on region. Expect charges at a new-car dealership
to be slightly higher.
| Item Name | Repair Cost |
| A/C Compressor | $1,345 |
| Alternator | $780 |
| Automatic Transmission or Transaxle | $4,210 |
| Brakes | $610 |
| Clutch, Pressure Plate, Bearing | |
| Constant Velocity Joints | $2,420 |
| Exhaust System | $1,405 |
| Radiator | $760 |
| Shocks and/or Struts | $6,340 |
| Timing Chain or Belt | $1,050 |
Our price chart for this generation Mercedes-Benz SL-Class details a range of prices in
year-by-year listings based on vehicle mileage and condition.
| Prices | Good | Average | Poor |
|
|
|||
| 2008 | |||
| SL55 AMG | $97,000-102,000 | $92,200-96,900 | $75,700-79,600 |
| SL550 | $77,500-81,000 | $73,600-77,000 | $59,700-62,400 |
| SL600 | $96,000-101,000 | $91,200-96,000 | $74,900-78,800 |
| SL65 AMG | $130,000-138,000 | $123,500-131,100 | $101,400-107,600 |
| 2007 | |||
| SL55 AMG | $81,000-85,000 | $77,000-80,800 | $62,400-65,500 |
| SL550 | $65,500-68,500 | $62,200-65,100 | $49,800-52,100 |
| SL600 | $80,500-84,000 | $76,500-79,800 | $62,000-64,700 |
| SL65 AMG | $105,000-110,000 | $99,800-104,500 | $81,900-85,800 |
| 2006 | |||
| SL500 | $54,500-57,000 | $51,200-53,600 | $40,900-42,800 |
| SL55 AMG | $66,000-69,000 | $62,700-65,600 | $50,200-52,400 |
| SL600 | $65,000-68,000 | $61,800-64,600 | $48,800-51,000 |
| SL65 AMG | $94,000-98,000 | $89,300-93,100 | $73,300-76,400 |
| 2005 | |||
| SL500 | $46,000-48,200 | $43,200-45,300 | $34,000-35,700 |
| SL55 AMG | $57,000-59,500 | $54,200-56,500 | $42,800-44,600 |
| SL600 | $56,500-59,000 | $53,700-56,100 | $42,400-44,300 |
| SL65 AMG | $84,000-87,500 | $79,800-83,100 | $64,700-67,400 |
| 2004 | |||
| SL500 | $39,500-41,500 | $36,700-38,600 | $28,400-29,900 |
| SL55 AMG | $49,500-51,500 | $46,500-48,400 | $37,100-38,600 |
| SL600 | $49,000-51,000 | $46,100-47,900 | $36,300-37,700 |
| 2003 | |||
| SL500 | $34,500-36,500 | $32,100-33,900 | $24,500-25,900 |
| SL55 AMG | $44,000-46,500 | $41,400-43,700 | $32,100-33,900 |
|
|
|||
This chart details a range of prices in year-by-year listings for vehicles in three condition levels:
Good: a clean low-mileage, solid-running vehicle that needs little or no repair.
Average: a car with normal miles on the odometer, perhaps a few scrapes or dings;
engine might need a minor repair or two, but runs acceptably well.
Poor: might have potentially dangerous problems with the engine and/or body, or
abnormally high mileage; definitely in need of mechanical attention. Valuations
reflect wholesale prices paid by dealers at auction, and retail prices on used-car
lots. Each range covers all trim levels and engine types for a vehicle with a typical
amount of equipment--usually an automatic transmission, air conditioning, stereo,
etc. Fully loaded vehicles may cost more. Average mileage is 12,000 miles per year. Keep
in mind that these are guidelines only. Actual selling prices vary- especially from
region to region.
Specs for this generation Mercedes-Benz SL-Class include everything from fuel mileage to seating capacity to options availability.
Vehicle Dimensions
| Specification | 2-door convertible | |
| Wheelbase, in. | 100.8 | |
| Overall Length, in. | 178.5 | |
| Overall Width, in. | 71.9 | |
| Overall Height, in. | 51.0 | |
| Curb Weight, lbs. | 4045 | |
| Cargo Volume, cu. ft. | 10.2 | |
| Standard Payload, lbs. | -- | |
| Fuel Capacity, gals. | 21.1 | |
| Seating Capacity | 2 | |
| Front Head Room, in. | 37.7 | |
| Max. Front Leg Room, in. | 42.9 | |
| Rear Head Room, in. | -- | |
| Max. Rear Leg Room, in. | -- | |
|
Specifications Key: NA = not available; "--" = measurement does not exist. |
||
Powertrain Options and Availability
Four powertrains have been available in SL-Class models. A 302-horsepower 5.0-liter V8 engine went into the SL500, mated to a seven-speed automatic transmission. The SL600 held a turbocharged 493-horsepower 5.5-liter V12, with a five-speed automatic. The supercharged 5.4-liter V8 in the SL55 AMG produces the same 493 horsepower but lower torque, and also worked with a five-speed automatic transmission. For 2005, the limited-production SL65 AMG got a 604-horsepower twin-turbo V12. For 2007, the SL550 replaces the SL500 and has a 382-hp V8 vs. 302 hp.
| Engines | cu. in |
Horse- power | Torque | Transmission: |
Consumer Guide Observed |
| ohc V8 | 5.0 / 303 | 302 | 339 | 7-speed automatic: 16/23 | 7-speed automatic: 19.5 |
| Supercharged ohv V8 | 5.4 / 332 | 493 | 516 | 5-speed automatic: 14/20 | 5-speed automatic: -- |
| Turbocharged ohv V12 | 6.0 / 365 | 604 | 738 | 5-speed automatic: 12/19 | 5-speed automatic: -- |
| Turbocharged ohv V12 | 5.5 / 336 | 493 | 590 | 5-speed automatic: 13/19 | 5-speed automatic: -- |
| dohc V8 | 5.5 / 333 | 382 | 391 | 7-speed automatic: 14/22 | 7-speed automatic: -- |
|
Specifications Key: NA = not available; "--" = measurement does not exist. |
|||||
Built In: Germany
Drive Wheels: longitudinal front-engine/rear-wheel drive
Detailed safety information for this generation Mercedes-Benz SL-Class include detailed crash test scores from the NHTSA.
NHTSA Crash-Test Results
Vehicle crash test information not available at this time.The National Highway Traffic Safety Administration (NHTSA) tests a vehicle's worthiness in front- and side-impact collisions and rates its resistance to rollovers. Front-impact crash-test numbers indicate the chance of serious injury: 5 = 10% or less; 4 = 10-20%; 3 = 20-35%; 2 = 35-45%; 1 = More than 45%. Sideimpact crash-test numbers indicate: 5 = 5% or less; 4 = 6-10%; 3 = 11-20%; 2 = 21-25%; 1 = More than 26%. Rollover resistance numbers indicate the chance for rollover when the vehicle leaves the roadway: 5 = Less than 10%; 4 = 10-20%; 3 = 20-30%; 2 = 30-40%; 1 = More than 40%.
Learn about official auto recalls, reliability issues, and vehicle problems for the 2003-2008 Mercedes-Benz SL-Class directly from the NHTSA and manufacturers.
NHTSA Recall History
2003-04 SL-Class:
If vehicle is not routinely serviced or brake system has seen heavy use over high mileage, electronic monitoring system of Sensotronic brake control may trigger the hydraulic function mode.
2003-04:
An incorrect software calibration number (SCN) coding received during a recent workshop visit can affect a number of functions: (1) the fuel gauge readings may be incorrect; (2) a stuck fuel-level sensor may not be displayed in the instrument cluster; (3) the check engine light may illuminate incorrectly; and, (4) the speedometer may be out of tolerance. In the event of a vehicle crash, the electrical fuel pump may not receive a crash signal that is required for the fuel pump to disconnect and prevent future fuel delivery as designed. Dealers will recode the SCN.
2003-06 SL-Class:
Sensotronic brake control system may prematurely shift to hydraulic backup function mode, due to deterioration of wiring harness connection of premature pump failure, resulting in greater pedal travel and required pressure.
2003-07 SL-Class equipped with Active Body Control (ABC) acceleration sensors on the front struts:
ABC sensors on either of the front struts may not transmit body movement data because of inconsistent soldering points. This could result in unexpected body movements at the front axle, which can adversely influence the vehicle's directional stability and could lead to a vehicle crash. Dealers will inspect and replace, if necessary, the front ABC sensors in all potentially affected vehicles.
2006:
An incorrect software calibration number (SCN) coding received during a recent workshop visit can affect a number of functions: (1) the fuel gauge readings may be incorrect; (2) a stuck fuel-level sensor may not be displayed in the instrument cluster; (3) the check engine light may illuminate incorrectly; and, (4) the speedometer may be out of tolerance. In the event of a vehicle crash, the electrical fuel pump may not receive a crash signal that is required for the fuel pump to disconnect and prevent future fuel delivery as designed. Dealers will recode the SCN.
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