The Mercedes G Class has Daytime Running Lights to help keep it more visible under all conditions. Daytime Running Lights decrease the chances of collisions. Canadian government studies show that driving with lights during the day reduces accidents by 11% by making vehicles more conspicuous. The Cayenne doesn’t offer Daytime Running Lights.
The G Class has standard Tele Aid, which uses a global positioning satellite (GPS) receiver and a cellular system to get 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 Cayenne doesn’t offer a GPS response system, only a navigation computer with no live response for emergencies.
Both the G Class and the Cayenne have standard driver and passenger frontal airbags, front seatbelt pretensioners, height adjustable front shoulder belts, four wheel antilock brakes, all wheel drive, traction control and electronic stability systems to prevent skidding.
Mercedes pays for scheduled maintenance on the G Class for 4 years and 50,000 miles. Mercedes will pay for oil changes, tire rotation, lubrication and any other scheduled maintenance. Porsche doesn’t pay scheduled maintenance for the Cayenne.
There are over 60 percent more Mercedes dealers than there are Porsche dealers, which makes it much easier to get service under the G Class’ warranty.
The engines in the G Class have a single overhead cam for simplicity. The engines in the Cayenne have dual overhead cams, which add to the number of moving parts and the complexity of the cylinder heads.
The G Class has a solid front axle with a floating power axle for durability that the Cayenne’s independent front suspension and exposed front driveshafts don’t offer.
The G500’s standard 5.0 SOHC V8 produces 26 lbs.-ft. more torque (336 vs. 310) than the Cayenne S’ standard 4.5 DOHC V8.
In an emergency stopping situation, many drivers don’t press the brakes with enough force to stop the vehicle in the shortest distance. Whatever factors cause this tendency, the G Class has a standard brake assist system to detect emergency braking situations (by how hard and how quickly the brake pedal is pressed) and then automatically apply maximum braking immediately in order to help prevent a collision. The Cayenne doesn’t offer a brake assist feature.
For better traction, the G Class has larger standard tires than the Cayenne (265/60R18 vs. 255/55R18). The G55’s tires are larger than the largest tires available on the Cayenne (285/55R18 vs. 275/45R19).
The G Class has a much larger cargo area with its rear seat up than the Cayenne with its rear seat up (45 vs. 19.1 cubic feet). The G Class has a much larger cargo area with its rear seat folded than the Cayenne with its rear seat folded (79.5 vs. 62.5 cubic feet).
The G Class’ memory seats store positions for the driver and front passenger. The Cayenne’s available memory system is only for the driver.
The G Class’ front and rear power windows lower automatically with one touch, especially convenient at tollbooths or drive-up windows. Only the front windows of the Cayenne work automatically with one touch.
The Cayenne’s standard power locks don’t automatically lock the doors. The G Class’ standard doors lock when a certain speed is reached. This is an important feature for occupant safety. Locked doors are proven to open less often in collisions, and they are also effective in preventing crime at traffic lights. (The power lock’s automatic feature may have to be activated by your dealer.)
The G Class has a standard automatic headlight on/off feature. When the ignition is on, the headlights automatically turn on at dusk and off after dawn. When the ignition turns off, the headlights turn off after a delay timed to allow you to securely get to your front door. The Cayenne doesn’t offer automatic headlights.
With optional voice command, the G Class offers the driver hands free control of the radio and cell phone by simply speaking. The Cayenne doesn’t offer a voice control system.