Best Six Cylinder Engines 2024. After a model update in 2023, the current lineup consists of six derivatives of the gls nameplate, two of which are powered by diesel engines, the gls 350d and gls 450d. These engines beg the questions.
After a model update in 2023, the current lineup consists of six derivatives of the gls nameplate, two of which are powered by diesel engines, the gls 350d and gls 450d. And just how much horsepower is too much?
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