Background
The W126 Mercedes S-Class range was available to the public for a 14-year period between 1979 and 1992, a relatively long production run that speaks volumes as to the correctness of the car’s original design and engineering.
The second model range to bear the S-Class designation, the W126 was originally offered as a three-box saloon with either a straight-six or a V8 petrol engine, or a turbocharged diesel. The C126, the two-door coupe version, was introduced in 1981, and additional engine options were made available throughout its life.
The model name still reflected the engine capacity back then (I know; didn’t that make life simpler?), which means that the 420SE you are looking at here is fitted with the 4.2-litre V8 engine. Bosch KE-Jetronic fuel injection helps it to be rated at 230bhp and 247lb/ft of torque, enough for an 8.2 second sprint to 60mph and a top speed of almost 140mph, which is impressive for a car that weighs more than 1,600kgs.
The reason it is so heavy is that the W126 S-Class is stuffed full of early adopter safety equipment including an optional driver’s airbag (available from 1981), passenger’s airbag (from 1987), traction control (1987), anti-lock brakes (optional until 1985, standard thereafter) plus seat-belt tensioning, crumple zones, and fluted taillights (which cleverly allowed the car to be seen from the rear even when it was dirty) from the very beginning.
A topographical sensor on the automatic gearbox pre-empted the GPS-linked gearbox that wowed us on the Rolls-Royce Wraith by several decades; self-levelling hydropneumatic suspension from Citroen was also offered, as was cruise control.
The S-Class has always been a luxurious car too, with eight-way, heated front seats and powered and heated rear seats making an appearance on the options list plus a proper climate control system and an exterior temperature gauge, both of which we might take for granted now but were ground-breaking innovations at the time.







