2020 Mercedes SLC vs. 2019 Porsche 911

Detailed Review, Specifications & Comparison

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Safety

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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 911 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 911 doesn’t offer a whiplash protection system.

The SLC’s optional lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane. The 911 doesn’t offer a lane departure warning system.

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 911 doesn’t offer a driver alert monitor.

Both the SLC and the 911 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, daytime running lights, rearview cameras, available blind spot warning systems and rear parking sensors.

Warranty

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There are over 2 times as many Mercedes dealers as there are Porsche dealers, which makes it much easier should you ever need service under the SLC’s warranty.

Reliability

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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 Porsche vehicles. J.D. Power ranks Mercedes 12th in initial quality. With 2 more problems per 100 vehicles, Porsche is ranked 15th.

Fuel Economy and Range

© 1999 - 2020 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2020/03/29

On the EPA test cycle the SLC 300 gets better fuel mileage than the 911 S RWD Auto 3.0 twin-turbo 6 cyl. (420 HP) (23 city/32 hwy vs. 22 city/28 hwy).

Environmental Friendliness

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In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes SLC higher (3 out of 10) than the Porsche 911 (1). This means the SLC produces up to 22.5 pounds less smog-producing pollutants than the 911 every 15,000 miles.

Transmission

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The Mercedes SLC comes standard with an automatic transmission, for driver comfort, especially in the city. Automatic costs extra on the 911.

A nine-speed automatic is standard on the Mercedes SLC, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the 911.

Tires and Wheels

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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 911; it requires you to depend on roadside assistance and your vehicle will have to be towed.

Chassis

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The SLC is 1 foot, 2.3 inches shorter than the 911, making the SLC easier to handle, maneuver and park in tight spaces.

The SLC’s standard power retractable hardtop allows a seamless transition from an open car, to a completely sealed coupe. The 911 doesn’t offer a retractable hardtop.

Cargo Capacity

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The SLC has a much larger trunk with its top down than the 911 Cabriolet (6.5 vs. 5.1 cubic feet).

With its convertible body style, valet key and remote trunk release lockout, the SLC offers cargo security. The 911’s non-lockable folding seat and non-lockable remote release defeat cargo security.

Ergonomics

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Unlike the driver-only memory system optional at extra cost in the 911, the SLC has standard driver and passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position and outside mirror angle and the front passenger seat also adjusts to the new passenger’s preset preferences.

The SLC’s standard easy entry system raises the steering wheel, making it easier for the driver to get in and out. An easy entry system costs extra on the 911.

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 911 can only operate the windows from inside the vehicle, with the ignition on.

In case of a sudden change of weather, the SLC offers an optional remote convertible top that can be raised from a distance to protect the interior of the vehicle from damage. The 911 doesn’t offer a remote top, so the driver will have to run to the car, get in, turn the ignition on and raise the top to prevent the interior from being damaged.

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 Porsche 911’s available Porsche Entry and Drive doesn’t unlock the trunk.

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 911 doesn’t offer heated windshield washer nozzles.

Economic Advantages

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Insurance will cost less for the SLC owner. The Complete Car Cost Guide estimates that insurance for the SLC will cost $12000 to $12685 less than the 911 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 $72979 to $85443 less than for the Porsche 911.

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