Mercedes GL450 Review: Power, Space, And Ownership Costs

The Mercedes-Benz GL450 stands out in the crowded luxury SUV segment as a vehicle that combines brute force with refined comfort, designed for families needing space without sacrificing premium features. Introduced as part of Mercedes’ full-size SUV lineup, the GL450 evolved through model years with engine updates from a potent V8 to a more efficient V6, maintaining its reputation for towing capability and highway prowess.

Engine Options and Power Delivery

Early GL450 models featured a 4.6-liter V8 engine producing 335 horsepower and substantial torque, paired with a smooth seven-speed automatic transmission. This setup delivered addictive acceleration, propelling the 5,249-pound SUV with surprising urgency in everyday driving. Later iterations, like the 2015 model, switched to a 3.0-liter twin-turbo V6 generating 362 horsepower and 369 lb-ft of torque, a shift that trimmed weight by up to 254 pounds while preserving most of the performance.

Acceleration tests confirm the GL450’s capability. The V8 version hit 60 mph in 5.9 seconds initially, maintaining that speed over 40,000 miles with only a negligible drop to 5.8 seconds. Quarter-mile times stayed consistent at 14.4 seconds. The V6-equipped 2015 model matched this 0-60 time at 5.9 seconds, though it lagged slightly at higher speeds, taking longer to reach 100 mph and 130 mph. Mercedes estimated the V6’s 0-60 at 6.6 seconds, placing it competitively mid-pack.

This table highlights how engine changes balanced power and efficiency without major performance losses.

Handling and Ride Quality

Despite its massive size, the GL450 handles urban environments with unexpected nimbleness, feeling solid on uneven roads and composed at highway speeds. Braking performance impresses for the vehicle’s heft, with 70-0 mph stops measuring 179 feet initially and improving to 169 feet after extensive testing. The brake pedal provides progressive feel, though initial travel offers less retardation, and repeated hard stops can lead to minor fade.

Steering is light and somewhat vague near center, sharpening slightly in Sport mode, but the GL450 prioritizes comfort over sporty dynamics. Optional Adaptive Damping and Active Curve systems maintain a level ride, making it ideal for long journeys rather than twisty roads. Stability control intervenes aggressively, limiting cornering grip to 0.73-0.77 g. For driving enthusiasts, alternatives like the Porsche Cayenne offer sharper responses in smaller packages.

Fuel Economy and Range

Fuel efficiency remains a mixed bag. The 2013 V8 averaged 16 mpg over 40,000 miles, matching its 14/19 city/highway EPA rating, with a 26.4-gallon tank providing a 396-mile range. The 2015 V6 improved EPA figures to 17/21 mpg (19 combined), though real-world tests mirrored the prior model’s 16 mpg. Diesel variants like the GL350 Bluetec achieved better 19/26 mpg (22 combined), with 8.4-second 0-60 times.

• V8 Reality: 16 mpg observed, suitable for those unconcerned by costs on an $90,000+ SUV.
• V6 Gains: Marginal EPA improvements, stop-start system aids slightly.
• Diesel Edge: Superior torque (455 lb-ft) and economy for long hauls.

Interior Space and Luxury Features

The GL450’s cavernous cabin seats seven comfortably, with power-folding third-row seats for cargo flexibility. High-quality materials and quiet operation create a sanctuary for family road trips. Advanced all-wheel drive, low-range gearing, hill descent control, and air suspension enable off-road competence, though it’s happiest on pavement.

Technology includes intuitive seven-speed shifts, optional paddle shifters for manual control, and luxury packs adding towing prowess. Videos of models like the 2011 GL450 CDI highlight its family-friendly towing in luxury guise.

Reliability and Ownership Costs

Reliability poses challenges. RepairPal rates the GL450 at 1.5/5.0, ranking 17th out of 19 luxury full-size SUVs, with average annual repair costs of $1,293—above industry norms due to frequent and severe issues. Long-term tests reported minimal repairs ($0) over 40,000 miles, but service hit $844. Maintenance on older models can be pricey, as noted in enthusiast reviews.

Pros include durable powertrains and structural integrity; cons are electronic glitches and high part costs. Buyers should budget for premium upkeep.

Comparisons with Rivals

Against the Audi Q7 or Porsche Cayenne, the GL450 offers more space but less agility. Its V6 matches acceleration while cutting weight, though torque dips from V8 peaks (406 to 369 lb-ft). Fuel economy trails diesel competitors but suits gasoline preferences.

Who Should Buy the Mercedes GL450?

Ideal for families prioritizing luxury, space, and straight-line speed over corner-carving. It’s a daily driver you’ll anticipate, blending Mercedes prestige with practical utility. Test older models for value, but inspect maintenance history given reliability scores.

Frequently Asked Questions (FAQs)

In summary, the Mercedes GL450 delivers commanding presence and versatile performance, tempered by efficiency and reliability trade-offs. Its evolution from V8 muscle to efficient V6 keeps it relevant for luxury SUV seekers.