LED lights have become more prominent with most versions sporting white daytime running lights in the lower bumper, standing lights and parking lights that switch to amber for front signals.   As parking lights a strip of LEDs below the headlamps and three vertically on the side illuminate, but as standing lights (as you might use when parallel-parked on a dark lane) only the three vertical lights and corresponding rear LEDs glow, so you could leave them on overnight without affecting the battery.   New tail lights that get rid of the body-colored strips within are attention-getting LED as well; V12 models get adaptive brake lights that blink rapidly during heavy braking.  

The S-Class design has discernible fender flares front and rear, classic grille more laid back, and a generally flowing shape not unlike the ultra-lux sister-brand Maybach.   These lines pay off in minimal noise and aero drag, high-speed stability, and an air of exclusivity afforded by the rear doors more than four feet long and the chrome strip framing the side glass.   AMG models get quad oval tail pipes, a more aggressive look and air management with visual mass added to the lower bodywork, deeper grille and larger diameter wheels available with the Sport package on non-AMG models.  

To keep weight down, the hood, door skins, and front fenders are constructed of aluminum alloys, as are the engine, transmission and most major suspension components, and the trunk lid is made of composite material.   Much of the rest is high-strength steel.   An S-Class is one of the best places to be in a big crash.  

Details are well executed, be they the gaps between body panels, the transition from glass to roof to glass again, mirrors that fold narrower than the widest part of the car or keyless entry that works effectively for all doors and the trunk.   All doors are self-sealing so you needn't slam them, positive door stops keep them at any position you open them to, there are no sharp edges inside or out, and the paintwork is very well finished.  

Apart from badges the S400 and S550 look similar, while the S600 gets V12 badges for the front fenders and dual double-square tailpipes.   S63 fender badges read 6.3 AMG in homage to past Mercedes cars of 6.3-liter fame (never mind the S63 engine is actually 6.2 liters).   The S65 fender merely has a V12 BITURBO that should make everyone else think twice before offering to run for pink slips.  

At least seven wheel styles are offered across the entire S-Class, from 18 to 20 inches in diameter.   Potential buyers should be aware that larger diameter wheels generally impart a less-smooth ride, don't shrug off potholes as well, and often have limitations regarding tire chains or winter tires for inclement climes.   We recommend the 18-inch wheels.