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The 911 offers all wheel drive to maximize traction under poor conditions, especially in ice and snow. The SL Class doesn’t offer all wheel drive.
Both the 911 and the SL Class have standard driver and passenger frontal airbags, front side-impact airbags, head airbags, front seatbelt pretensioners, height adjustable front shoulder belts, four wheel antilock brakes, traction control and electronic stability systems to prevent skidding.
The 911’s corrosion warranty is 6 years and unlimited miles longer than the SL Class’ (10/unlimited vs. 4/50,000).
The flat cylinder configuration of the boxer engine in the 911 lowers its center of gravity, enhancing handling stability. The SL Class doesn’t offer a boxer engine configuration.
On the EPA test cycle the 911 gets better fuel mileage than the SL Class:
911 |
SL Class |
|||
RWD |
911/Manual |
18 city/26 hwy |
n/a |
|
911 S/Manual |
18 city/26 hwy |
n/a |
||
911/Auto |
19 city/26 hwy |
16 city/24 hwy |
SL500 |
|
911 S/Auto |
18 city/25 hwy |
14 city/20 hwy |
SL55 |
|
AWD |
911 4/Auto |
18 city/26 hwy |
n/a |
|
911 4S/Auto |
18 city/25 hwy |
n/a |
For better stopping power the 911’s standard front brake rotors are larger than those on the SL Class:
911 |
SL Class |
|
Front Rotors |
12.52 inches |
12.28 inches |
The 911’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs standard on the SL500 are solid, not vented.
The 911 offers optional heat-treated ceramic brake rotors, which last ten to twenty times as long as conventional cast iron rotors, don’t rust, don’t fade during repeated high speed braking, and their lighter weight contribute to better braking, handling and acceleration. The SL Class doesn’t offer ceramic brake rotors.
The 911 stops much shorter than the SL Class:
911 |
SL Class |
||
80 to 0 MPH |
184 feet |
205 feet |
Road & Track |
70 to 0 MPH |
150 feet |
178 feet |
Car and Driver |
60 to 0 MPH |
106 feet |
117 feet |
Motor Trend |
The Porsche 911 may be more efficient, handle and accelerate better because it weighs about 1000 to 1050 pounds less than the Mercedes SL Class.
The 911 has standard seating for 4 passengers; the SL Class can only carry 2.
The 911 has 6.2 cubic feet more passenger volume than the SL Class (64 vs. 57.8).
The 911’s instruments include an oil pressure gauge and a temperature gauge – which could save your engine! Often ‘idiot lights’ don’t warn you until damage has been done. The SL Class does not have an oil pressure gauge.
The 911’s standard power mirror controls are mounted on the door for easy access. The SL Class’ standard power mirror controls are on the center console where they can’t be seen without the driver completely removing his eyes from the road.
The headlight lenses on the 911 are made of plastic to be lighter, more resistant to damage and less expensive to replace than the glass headlight lenses on the SL Class.
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