If you have been following our articles, you may have already seen the newest V8 engine from Mercedes-Benz: the M177/178 with 4.0L displacement and twin-turbochargers, which currently is only available on the AMG models (the AMG GT and also the W205 C63 AMG). However, Mercedes-Benz has decided to gradually phase out the aging M278 4.7L turbo V8 with this new M177/178 V8, and the first non-AMG model that receives this treatment is the 2016 GLS500 (not sold in US).
According to Mercedes-Benz, the 2016 model year GLS500 (the previous GL500) will use a detuned version of the M177 engine, which output is rated at 421 ps and 443 lb-ft (600 Nm) of torque, mated to the 7-speed a...
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