Mercedes-Benz Gls Years to AvoidThe weakest years — and the one you should buy instead
After reviewing every Mercedes-Benz Gls we've analyzed (9 years), these are the 1 weakest. Each one has either an absolute low reliability score, chronic repair issues, or unusually high ownership costs relative to other Gls years.
Proceed with caution
2018 Mercedes-Benz Gls
The 2018 Mercedes-Benz GLS is a luxurious and capable full-size SUV that offers impressive comfort and performance, but its complex engineering brings a significant risk of expensive repairs as it ages. While it provides an opulent experience, prospective owners must budget generously for potential air suspension and electrical system issues to truly enjoy this vehicle without financial surprises.
Why this year scores low
The air springs, compressor, valve block, and ride height sensors are notorious failure points. Leaks in the airbags or compressor failure lead to a 'saggy' suspension and inability to maintain ride height, drastically impacting ride quality and potentially damaging other components.
Mercedes' complex electrical architecture is prone to various issues including parasitic battery drains, sensor failures (e.g., NOx, speed), infotainment glitches, and control module (ECM, TCU, SAM units) malfunctions, often requiring costly diagnostics and replacements.
Particularly on the V8 (M278) and less so on the V6 (M276) engines, oil leaks from the front timing cover, oil filter housing, and valve cover gaskets are common. PCV (Positive Crankcase Ventilation) valve failures can also lead to excessive oil consumption and smoke.