For enhanced safety, the front shoulder belts of the Cadillac SRX are height-adjustable, and the rear seat shoulder belts have child comfort guides to move the belt to properly fit children. A better fit can prevent injuries and the increased comfort also encourages children to buckle up. The Mercedes GLK-Class has only front height-adjustable seat belts.
Both the SRX and GLK-Class have child safety locks to prevent children from opening the rear doors. The SRX has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The GLK-Class’ child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.
Over 200 people are killed each year when backed over by motor vehicles. The SRX offers optional Rear Automatic Braking which use rear sensors to monitor and automatically apply the brakes to prevent a rear collision. The GLK-Class doesn’t offer backup collision prevention brakes.
To help make backing safer, the SRX’s optional cross-path warning system uses wide-angle radar in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The GLK-Class doesn’t offer a cross-path warning system.
Both the SRX and the GLK-Class have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front seatbelt pretensioners, height-adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding and available all wheel drive.
Cadillac’s powertrain warranty covers the SRX 2 years and 20,000 miles longer than Mercedes covers the GLK-Class. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 6 years or 70,000 miles. Coverage on the GLK-Class ends after only 4 years or 50,000 miles.
The SRX’s corrosion warranty is 2 years and unlimited miles longer than the GLK-Class’ (6/unlimited vs. 4/50,000).
Cadillac pays for scheduled maintenance on the SRX for 4 years and 50,000 miles. Cadillac will pay for oil changes, lubrication and any other required maintenance. Mercedes doesn’t pay scheduled maintenance for the GLK-Class.
There are almost 5 times as many Cadillac dealers as there are Mercedes dealers, which makes it much easier should you ever need service under the SRX’s warranty.
The SRX’s 3.6 DOHC V6 produces 6 more horsepower (308 vs. 302) than the GLK-Class’ 3.5 DOHC V6.
To lower fuel costs and make buying fuel easier, the Cadillac SRX uses regular unleaded gasoline. The GLK-Class requires premium, which can cost 20 to 55 cents more per gallon.
The SRX has 5.4 gallons more fuel capacity than the GLK-Class Diesel’s standard fuel tank (21 vs. 15.6 gallons), for longer range between fill-ups. The SRX has 3.6 gallons more fuel capacity than the GLK-Class Gas’ standard fuel tank (21 vs. 17.4 gallons).
For better stopping power the SRX’s brake rotors are larger than those on the GLK-Class:
The Cadillac SRX’s wheels have 6 lugs for longer wheel bearing life, less chance of rotor warping and greater strength. The Mercedes GLK-Class only has 5 wheel lugs per wheel.
For a smoother ride and more stable handling, the SRX’s wheelbase is 2 inches longer than on the GLK-Class (110.5 inches vs. 108.5 inches).
For better handling and stability, the track (width between the wheels) on the SRX is 3.1 inches wider in the front and 2.6 inches wider in the rear than on the GLK-Class.
The SRX 4 handles at .82 G’s, while the GLK350 4MATIC pulls only .76 G’s of cornering force in a Motor Trend skidpad test.
The SRX 4 executes Motor Trend’s “Figure Eight” maneuver 1.3 seconds quicker than the GLK350 4MATIC (27.2 seconds @ .63 average G’s vs. 28.5 seconds @ .55 average G’s).
The SRX uses computer-generated active noise cancellation to help remove annoying noise and vibration from the passenger compartment, especially at low frequencies. The GLK-Class doesn’t offer active noise cancellation.
The SRX has .7 inches more front headroom, 3.1 inches more front shoulder room, 1.2 inches more rear legroom and .9 inches more rear shoulder room than the GLK-Class.
For enhanced passenger comfort on long trips the SRX’s rear seats recline. The GLK-Class’ rear seats don’t recline.
The SRX has a much larger cargo area with its rear seat up than the GLK-Class with its rear seat up (29.8 vs. 16.5 cubic feet). The SRX has a much larger cargo area with its rear seat folded than the GLK-Class with its rear seat folded (61.1 vs. 54.7 cubic feet).
The SRX offers a remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The GLK-Class doesn’t offer a remote starting system.
The SRX’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 GLK-Class does not have an oil pressure gauge.
To improve rear visibility by keeping the rear window clear, the SRX has a standard rear fixed intermittent wiper with a full on position. The rear wiper standard on the GLK-Class only has an intermittent setting, so in a hard rain visibility isn’t as good.
Consumer Reports rated the SRX’s headlight performance “Good,” a higher rating than the GLK-Class’ headlights, which were rated “Poor.”
Both the SRX and the GLK-Class offer optional heated front seats. The SRX also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the GLK-Class.
The SRX’s optional air conditioned front seats cool the driver and front passenger and help take the sting out of hot leather in Summer. The GLK-Class doesn’t offer air conditioned front seats.
Insurance will cost less for the SRX owner. The Complete Car Cost Guide estimates that insurance for the SRX will cost $180 to $1580 less than the GLK-Class over a five-year period.
According to The Car Book by Jack Gillis, the SRX is less expensive to operate than the GLK-Class because it costs $1395 less to do the manufacturer’s suggested maintenance for 50,000 miles. Typical repairs cost much less on the SRX than the GLK-Class, including $237 less for a water pump, $332 less for an alternator, $618 less for a starter, $43 less for fuel injection, $264 less for front struts, $769 less for a timing belt/chain and $214 less for a power steering pump.
The SRX was chosen as one of Car and Driver’s “Top Five Trucks” for 3 of the last 11 years. The GLK-Class has never been a Car and Driver “Top Five Truck” pick.
The Cadillac SRX outsold the Mercedes GLK-Class by 55% during the 2014 model year.