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Sunday 1 October 2017

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2018 Mercedes-Benz S-class Sedan Lineup Detailed from Top to Bottom

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In the new 2018 S-class, the cruise control automatically adjusts its speed for curves, intersections, changes in the speed limit, and toll plazas. (Its knowledge of the terrain is based on GPS data.) This goes a step beyond the functionality previously offered in the mid-size E-class. The net effect is that one can use cruise control—and its attendant steering-assist function—much more often on secondary roads and not just on highways.



This could be the biggest development in cruise control since adaptive cruise allowed drivers to use the feature in heavy traffic, provided that drivers get comfortable with it. It is a little harder to trust than simple adaptive cruise control. With the car in its default Comfort driving mode, the cruise control will slow considerably for curves—more so than you might on your own—before quickly accelerating back to the set speed. In Sport or Sport+, however, it doesn’t slow as much and carries more momentum through corners.


That aspect works fine, but what’s somewhat disconcerting is learning to trust the car to slow on its own when approaching intersections, because the driver must be ready to brake for oncoming traffic at a yield or to brake for a stop at a stop sign. If there’s no oncoming traffic at a yield and no braking is required, the driver can stay off the brakes and let the car do it all; if one does have to brake at a yield or for a stop, the driver afterward needs to hit the resume button to reactivate cruise control. (The resume and other cruise-control switches have moved to the left spoke of the steering wheel; M-B’s stalk-mounted controls are no more.) In addition to slowing for curves or intersections on the current road, if the driver indicates a turn onto a side street or into a parking lot, the car again will automatically slow for it.


Other changes to the S-class are more notable when a human is in control, with the biggest found under the hood. A new base-model S450 employs a V-6 engine making 362 horsepower from 3.0 liters and a pair of turbochargers. The mainstay S550 becomes the S560—resurrecting a longtime S-class model number—as its twin-turbo V-8 increases in output even as it decreases in displacement. Its previous 449-hp 4.7-liter V-8 is supplanted by a 4.0-liter good for 463 horsepower and 516 lb-ft of torque.
The AMG versions retain their S63 and S65 model names. The eight-cylinder S63 downsizes its V-8 from 5.5 liters to the new 4.0-liter shared with the S560. AMG, however, manages to extract 603 horsepower and 664 lb-ft from those four liters, a gain of 26 horsepower over the old 5.5-liter engine (torque is unchanged). The S65 retains its V-12, which evidently has plateaued at 621 horsepower and 738 lb-ft. That V-12 also appears in the S650 Maybach. Not yet for our market is a new inline-six engine with an electric supercharger along with a conventional turbo, an integrated 48-volt starter/alternator, and direct-drive accessories. (There also will be a diesel inline-six that we’ll probably never see in America.) We drove the S560 and the S63, which arrive on our shores this fall. Despite not getting a new model designation, the S63 has more mechanical changes. In addition to the new engine, it trades its seven-speed automatic transmission for a nine-speed unit. Its standard all-wheel-drive system, 4MATIC+, offers a variable front-to-rear split. (The S560 retains the fixed, rear-biased 4MATIC system, but it’s optional.)  
 

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