2020 Lexus RX Series vs. 2020 Mercedes GLB

Detailed Review, Specifications & Comparison

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Safety

© 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 2020/06/04

The RX Series has standard Active Headrests, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the Active Headrests system moves the headrests forward to prevent neck and spine injuries. The GLB doesn’t offer a whiplash protection system.

Over 200 people are killed each year when backed over by motor vehicles. The RX Series offers optional Auto Brake that uses rear sensors to monitor and automatically apply the brakes to prevent a rear collision. The GLB doesn’t offer backup collision prevention brakes.

To help make backing safer, the RX Series’ 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 GLB doesn’t offer a cross-path warning system.

Both the RX Series and the GLB have standard driver and passenger frontal airbags, front and rear side-impact airbags, driver knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, front wheel drive, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, driver alert monitors, available all wheel drive, blind spot warning systems and around view monitors.

For its top level performance in IIHS driver and passenger-side small overlap frontal, moderate overlap frontal, side impact, roof strength and head restraint tests, its standard vehicle-to-vehicle front crash prevention system, its standard vehicle-to-pedestrian front crash prevention system, and its available headlight’s “Acceptable” rating, the Insurance Institute for Highway Safety grants the RX Series the rating of “Top Pick” for 2020, a rating granted to only 30 vehicles tested by the IIHS. The GLB has not been tested, yet.

Warranty

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Lexus’ powertrain warranty covers the RX Series 2 years and 20,000 miles longer than Mercedes covers the GLB. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 6 years or 70,000 miles. Coverage on the GLB ends after only 4 years or 50,000 miles.

The RX Series’ corrosion warranty is 1 year longer than the GLB’s (6 vs. 5 years).

Reliability

© 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 2020/06/04

J.D. Power and Associates rated the RX Series first among midsize premium SUVs in their 2019 Initial Quality Study. The GLB isn’t in the top three in its category.

J.D. Power and Associates’ 2019 Initial Quality Study of new car owners surveyed provide the statistics that show that Lexus vehicles are better in initial quality than Mercedes vehicles. J.D. Power ranks Lexus 8th in initial quality, above the industry average. With 4 more problems per 100 vehicles, Mercedes is ranked 12th, below the industry average.

J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Lexus vehicles are more reliable than Mercedes vehicles. J.D. Power ranks Lexus first in reliability, above the industry average. With 28 more problems per 100 vehicles, Mercedes is ranked 13th.

From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that Lexus vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks Lexus first in reliability. Mercedes is ranked 21st.

Engine

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The RX 350’s standard 3.5 DOHC V6 produces 74 more horsepower (295 vs. 221) and 10 lbs.-ft. more torque (268 vs. 258) than the GLB’s 2.0 turbo 4-cylinder. The RX 450h’s standard 3.5 DOHC V6 hybrid produces 87 more horsepower (308 vs. 221) than the GLB’s 2.0 turbo 4-cylinder.

Fuel Economy and Range

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On the EPA test cycle the RX 450h gets better fuel mileage than the GLB 250 4MATIC (31 city/28 hwy vs. 23 city/31 hwy).

Regenerative brakes improve the RX Series Hybrid’s fuel efficiency by converting inertia back into energy instead of wasting it. The GLB doesn’t offer a regenerative braking system.

The RX Series Hybrid’s standard fuel tank has 1.3 gallons more fuel capacity than the GLB (17.2 vs. 15.9 gallons), for longer range between fill-ups. The RX Series’ standard fuel tank has 3.3 gallons more fuel capacity than the GLB (19.2 vs. 15.9 gallons).

Transmission

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The RX 450h has a standard continuously variable transmission (CVT). With no “steps” between gears, it can keep the engine at the most efficient speed for fuel economy, or keep it at its peak horsepower indefinitely for maximum acceleration. The GLB doesn’t offer a CVT.

Brakes and Stopping

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The RX Series’ standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs on the GLB are solid, not vented.

Suspension and Handling

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The RX Series has standard front and rear gas-charged shocks for better control over choppy roads. The GLB’s suspension doesn’t offer gas-charged shocks.

For better handling and stability, the track (width between the wheels) on the RX Series is 1.2 inches wider in the front and .8 inches wider in the rear than on the GLB.

For greater off-road capability the RX Series has a greater minimum ground clearance than the GLB (8.2 vs. 7.9 inches), allowing the RX Series to travel over rougher terrain without being stopped or damaged.

Passenger Space

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The RX Series has 3 inches more front legroom, 1.9 inches more front shoulder room and 2.7 inches more rear shoulder room than the GLB.

Servicing Ease

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J.D. Power and Associates surveys of service recipients show that Lexus service is better than Mercedes. J.D. Power ranks Lexus second in service department satisfaction. With a 11% lower rating, Mercedes is ranked fifth.

Ergonomics

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To improve rear visibility by keeping the rear window clear, the RX Series has a standard rear fixed intermittent wiper with a full on position. The rear wiper standard on the GLB only has an intermittent setting, so in a hard rain visibility isn’t as good.

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The RX Series offers available headlight washers to keep headlight output high. The GLB doesn’t offer headlight washers.

Manual rear side window sunshades are available in the RX Series to help block heat and glare for the rear passengers. The GLB doesn’t offer rear side window sunshades.

Both the RX Series and the GLB offer optional heated front seats. The RX Series also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated second row seats aren’t available in the GLB.

The RX Series offers an optional 115-volt a/c outlet on the center console, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The GLB doesn’t offer a house-current electrical outlet.

Recommendations

© 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 2020/06/04

Consumer Reports® chose the Lexus RX Series as its “Top Pick,” the highest scoring vehicle in its category, based on reliability, safety and performance.

The Lexus RX Series outsold the Mercedes GLB by almost 95 to one during 2019.

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