Ever since Mercedes-Benz announced that it was returning to straight-sixes last year, we've been waiting to find out when this new engine would come to the US. We were disappointed to learn that Merc's inline-six wouldn't be sold in the US-market 2018 S-Class, but we'll finally get our hands on it next year. Our friends at that the 2019 CLS will get smooth inline-six power right here in the US.
First, we'll get the 2019 CLS450, which offers 367 horsepower and 369 lb-ft of torque from its 3.0-liter six, and later, there'll be a more powerful AMG model, the CLS53. Car and Driver doesn't have specs on the CLS53, but we've heard that it should make around 430 hp.
Car and Driver's Davey G. Johnson, who snagged a ride in a CLS450 prototype, says that the 3.0-liter inline-six provided strong acceleration and a nice, if too-quiet noise. This engine also uses a 48-volt electric system dubbed EQ Power that Johnson says makes stop-start functionality totally seamless.
As we've reported before, is based around a crank-mounted electric generator that powers the water pump and A/C compressor. This system also allows Mercedes to replace the traditional starter motor and belt-driven alternator with a single electric unit. So this engine doesn't actually use belts at all.
Mercedes won't offer a V8 in the new CLS, though, since it would likely overlap with AMG's upcoming four-door GT. Other markets will get four-cylinders and diesel engines, but the US only gets Merc's inline-six.
Car and Driver says we'll see the 2019 CLS450 at the LA Auto Show next month, and the AMG should arrive not too long after. Hopefully, we'll see this engine appear in other Mercedes models soon too.