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The SLC’s optional pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The 4C doesn’t offer pre-crash pretensioners.
The SLC has standard NECK-PRO Head Restraints, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the NECK-PRO Head Restraints system moves the headrests forward to prevent neck and spine injuries. The 4C doesn’t offer a whiplash protection system.
The SLC has a standard Active Brake Assist, which uses forward mounted sensors to warn the driver of a possible collision ahead. If the driver doesn’t react and the system determines a collision is imminent, it automatically applies the brakes at full-force in order to reduce the force of the crash or avoid it altogether. The 4C doesn't offer collision warning or crash mitigation brakes.
The SLC’s optional lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane. The 4C doesn’t offer a lane departure warning system.
The SLC offers optional Parktronic™ to help warn the driver about vehicles, pedestrians or other obstacles behind or in front of their vehicle. The 4C doesn’t offer a front parking aid.
The SLC’s optional blind spot warning system uses digital cameras monitored by computer to alert the driver to moving objects in the vehicle’s blind spots where the side view mirrors don’t reveal them. The 4C doesn’t offer a system to reveal objects in the driver’s blind spots.
The SLC’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The 4C doesn’t offer a driver alert monitor.
The SLC has standard Mercedes-Benz Emergency Call, which uses a global positioning satellite (GPS) receiver and a cellular system to get turn-by-turn driving directions, remotely unlock your doors if you lock your keys in, help track down your vehicle if it’s stolen or send emergency personnel to the scene if any airbags deploy. The 4C doesn’t offer a GPS response system, so if you’re involved in an accident and you’re incapacitated help may not come as quickly.
Both the SLC and the 4C have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights and rearview cameras.
The Mercedes SLC weighs 897 pounds more than the Alfa Romeo 4C. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts. Crosswinds also affect lighter cars more.
The SLC’s corrosion warranty is 1 year longer than the 4C’s (5 vs. 4 years).
There are over 2 times as many Mercedes dealers as there are Alfa Romeo dealers, which makes it much easier should you ever need service under the SLC’s warranty.
A hardened steel chain, with no maintenance needs, drives the camshafts in the SLC’s engine. A rubber cam drive belt that needs periodic replacement drives the 4C’s camshafts. If the 4C’s belt breaks, the engine could be severely damaged when the pistons hit the opened valves.
J.D. Power and Associates’ 2019 Initial Quality Study of new car owners surveyed provide the statistics that show that Mercedes vehicles are better in initial quality than Alfa Romeo vehicles. J.D. Power ranks Mercedes 12th in initial quality. With 24 more problems per 100 vehicles, Alfa Romeo is ranked 29th.
From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that Mercedes vehicles are more reliable than Alfa Romeo vehicles. Consumer Reports ranks Mercedes 8 places higher in reliability than Alfa Romeo.
The SLC’s 2.0 turbo 4-cylinder produces 4 more horsepower (241 vs. 237) and 15 lbs.-ft. more torque (273 vs. 258) than the 4C’s 1.8 turbo 4-cylinder.
In heavy traffic or at stoplights the SLC’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) The 4C doesn’t offer an automatic engine start/stop system.
The SLC has 5.4 gallons more fuel capacity than the 4C (15.9 vs. 10.5 gallons), for longer range between fill-ups.
In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes SLC higher (3 out of 10) than the Alfa Romeo 4C (1). This means the SLC produces up to 22.5 pounds less smog-producing pollutants than the 4C every 15,000 miles.
A nine-speed automatic is standard on the Mercedes SLC, for better acceleration and lower engine speed on the highway. Only a six-speed automatic is available for the 4C.
For better stopping power the SLC’s brake rotors are larger than those on the 4C:
For better traction, the SLC has larger tires than the 4C (F:225/45R17 & R:245/40R17 vs. F:205/45R17 & R:235/40R18).
The SLC has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the 4C; it requires you to depend on roadside assistance and your vehicle will have to be towed.
The SLC offers an optional driver-adjustable suspension system. It allows the driver to choose between an extra-supple ride, reducing fatigue on long trips, or a sport setting, which allows maximum control for tricky roads. The 4C’s suspension doesn’t offer adjustable shock absorbers.
The SLC has standard power steering to make quick and controllable low speed maneuvers easy. The 4C doesn’t offer power steering.
The SLC has vehicle speed sensitive variable-assist power steering, for low-effort parking, better control at highway speeds and during hard cornering, and a better feel of the road. The 4C doesn’t offer variable-assist power steering.
For a smoother ride and more stable handling, the SLC’s wheelbase is 2 inches longer than on the 4C (95.7 inches vs. 93.7 inches).
For better maneuverability, the SLC’s turning circle is 3.7 feet tighter than the 4C’s (36.8 feet vs. 40.5 feet).
The design of the Mercedes SLC amounts to more than styling. The SLC has an aerodynamic coefficient of drag of .33 Cd. That is lower than the 4C (.341) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the SLC get better fuel mileage.
The SLC’s standard power retractable hardtop allows a seamless transition from an open car, to a completely sealed coupe. The 4C doesn’t offer a retractable hardtop.
The SLC has a much larger trunk with its top down than the 4C Spider (6.5 vs. 3.7 cubic feet).
With its convertible body style, valet key and remote trunk release lockout, the SLC offers cargo security. The 4C’s non-lockable remote release defeats cargo security.
The SLC uses gas struts to support the hood for easier service access. The 4C uses a prop rod to support its heavy hood. It takes two hands to open the hood and set the prop rod, the prop rod gets in the way during maintenance and service, and the prop rod could be knocked out, causing the heavy hood to fall on the person maintaining or servicing the car.
The engine in the SLC is mounted longitudinally (North-South), instead of sideways, as in the 4C. This makes it easier to service and maintain, because the accessory belts are in front.
When three different drivers share the SLC, the memory system makes it convenient for all three. Each setting activates different, customized memories for the driver and front passenger’s seat positions, steering wheel position and outside mirror angle. The 4C doesn’t offer a memory system.
The SLC’s standard easy entry system raises the steering wheel, making it easier for the driver to get in and out. The 4C doesn’t offer an easy entry system.
The SLC’s power parking brake sets with one touch and releases with one touch or automatically. The 4C has a lever-type parking brake that has to be strenuously raised to engage properly. It has to be lifted up more and a button depressed to release it.
The SLC’s front power windows open or close with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside of the car. The 4C’s power windows’ switches have to be held the entire time to close them fully.
The SLC’s standard power window controls are mounted on the armrest for easy access. The 4C’s available power window controls are spread out on the center console where they can’t be seen without the driver completely removing his eyes from the road.
If the windows are left open on the SLC the driver can close them all at the outside door handle or from a distance using the remote (remote must be aimed at door sensor). On a hot day the driver can lower the windows from a distance using the keyless remote. The driver of the 4C can only operate the windows from inside the vehicle, with the ignition on.
Keyless-Go optional on the SLC allows you to unlock the driver’s door, trunk and start the engine all without removing a key from pocket or purse. This eliminates searching for keys before loading groceries, getting in the vehicle in bad weather or making a hurried start to your trip. The Alfa Romeo 4C doesn’t offer an advanced key system.
The SLC has a standard locking fuel door with a remote release located convenient to the driver. A locking fuel door helps prevent vandalism, such as sugar in the tank and fuel theft. The 4C doesn’t offer a locking fuel door.
The SLC’s rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The 4C’s intermittent wipers change speed with vehicle speed, but can’t turn on and off or change speed based on changing rainfall.
Heated windshield washer nozzles are standard on the SLC to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The 4C doesn’t offer heated windshield washer nozzles.
In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The SLC offers available headlight washers to keep headlight output high. The 4C doesn’t offer headlight washers.
The SLC has a standard automatic headlight on/off feature. When the ignition is on, the headlights automatically turn on at dusk and off after dawn. The 4C doesn’t offer automatic headlights.
While driving with high beams on, sensitive light sensors available for the SLC detect other vehicles which could be blinded and automatically switch to low beams. The 4C doesn’t offer automatic dimming high beams.
To help drivers avoid possible obstacles, the SLC offers optional cornering lights to illuminate around corners when the turn signals are activated. The 4C doesn’t offer cornering lights. The SLC also offers optional adaptive headlights to illuminate around corners automatically by reading vehicle speed and steering wheel angle.
The SLC’s sun-visors swivel front-to-side to block glare from the side windows. The 4C’s visors are fixed into the windshield header.
The SLC’s power mirror controls are mounted on the armrest for easy access. The 4C’s power mirror controls are on the center console where they can’t be seen without the driver completely removing his eyes from the road.
When the SLC is put in reverse, the passenger rearview mirror tilts from its original position. This gives the driver a better view of the curb during parallel parking maneuvers. Shifting out of reverse puts the mirror into its original position. The 4C’s mirror doesn’t automatically adjust for backing.
The SLC’s standard rear and side view mirrors have an automatic dimming feature. These mirrors can be set to automatically darken quickly when headlights shine on them, keeping following vehicles from blinding or distracting the driver. The 4C doesn’t offer the luxury of automatic dimming mirrors.
The SLC offers optional heated front seats, which keep the driver and front passenger extremely comfortable in the winter. Heated seats aren’t available in the 4C.
The SLC’s optional dual zone air conditioning allows the driver and front passenger to choose two completely different temperatures so people with different temperature preferences won’t have to compromise. This makes both the driver and front passenger as comfortable as possible. The 4C doesn’t offer dual zone air conditioning.
The SLC’s optional automatic temperature control maintains the temperature you set, automatically controlling fan speed, vents and temperature to maintain a consistent, comfortable environment. The 4C doesn’t offer automatic air conditioning.
A built-in pollen filter removes pollen, exhaust fumes and other pollutants from the SLC’s passenger compartment. This helps prevent lung and/or sinus irritation, which can trigger allergies or asthma. The 4C doesn’t offer a filtration system.
To keep a safe, consistent following distance, the SLC offers an optional Active Distance Assist Distronic, which alters the speed of the vehicle without driver intervention. This allows the driver to use cruise control more safely without constantly having to disengage it when approaching slower traffic. The 4C doesn’t offer an adaptive cruise control.
To help keep the driver’s hands on the wheel, the SLC has standard steering wheel controls for the radio. The 4C doesn’t offer steering wheel audio controls.
To direct the driver from any location to a given street address with audible turn-by-turn directions, a GPS navigation system is available on the SLC. The SLC’s navigation system also has a real-time traffic update feature that offers alternative routes to automatically bypass traffic problems. (Service not available in all areas.) The 4C doesn’t offer a navigation system.
With optional voice command, the SLC offers the driver hands free control of the radio and the navigation computer by simply speaking. The 4C doesn’t offer a voice control system.
Insurance will cost less for the SLC owner. The Complete Car Cost Guide estimates that insurance for the SLC will cost $3885 to $4570 less than the 4C over a five-year period.
IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the Mercedes SLC will be $1790 to $14254 less than for the Alfa Romeo 4C.
The Mercedes SLC outsold the Alfa Romeo 4C by almost 13 to one during 2019.
© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.
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