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2018 Mercedes-Benz GLS-class | Engine and Transmission Review
GLS-class buyers are confronted with a choice between two powerful, competent powertrains, and either provides ample motivation for this Benz brawler. An adjustable air-spring suspension adds versatility and off-road credibility to the luxury SUV.
What’s New for 2018?
There are no changes to the GLS-class’s powertrains this year. We still haven’t driven or tested a GLS550, but we’re as happy as ever with the GLS450’s twin-turbo V-6 and its nine-speed automatic transmission.
2017 Mercedes-Benz GLS-class
The base engine found in the GLS450 is a purring and muscular 362-hp twin-turbocharged 3.0-liter V-6, while a stout 449-hp twin-turbo 4.7-liter V-8 powers the GLS550. Both engines pair with a nine-speed automatic transmission, which is optimized for highway cruising. The nine-speed shifts smoothly and rarely stumbles, but the twin-turbo 3.0-liter V-6 is the real star—in our testing, it was as quick as the competition’s V-8s.
In Sport mode, the transmission selects lower gears and holds shifts longer (too long, sometimes); in Comfort mode, fuel economy is prioritized, and the transmission is prone to upshift earlier. An available Off-Road Plus mode uses the low-range gearbox and center-differential lock to keep the GLS moving over demanding landscapes.
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