420 SEL (special protection version)

Combustion principle:
four-stroke petrol (with manifold injection; emission control system with closed-loop 3-way catalyst as an option, from 09.1986 as standard)
Configuration:
front, longitudinal; vertical
Engine type:
M 116 E 42 / 116.965
Number of cylinders / arrangement:
8 / 90° V; light-alloy block
Bore x Stroke:
92.0 x 78.9 mm
Total displacement:
4196 cc (tax classification: 4146 cc)
Compression ratio:
9.0; from 09.1987: 10.0
Rated output:
218 hp / 160 kW (with catalyst 204 hp / 150 kW) at 5200 rpm;~from 09.1987: 231 hp / 170 kW (with catalyst 224 hp / 165 kW) at 5400 rpm
Rated torque:
330 Nm at 3750 rpm (with catalyst 310 Nm at 3600 rpm);~from 09.1987: 335 Nm (with catalyst 325 Nm) at 4000 rpm
Number of valves / arrangement:
1 intake, 1 exhaust / overhead
Valve operation:
1 overhead camshaft per cylinder bank
Camshaft drive:
double roller chain
Fuel system:
manifold injection, mechanically-electronically controlled~(Bosch KE-Jetronic)
Fuel tank: position / capacity:
above the rear axle / 90 l

Frame design:
steel unit body
Front-wheel suspension:
double wishbone
Rear-wheel suspension:
semi-trailing arm axle (hydropneumatic level control optional)
Front springs:
coil springs, supplementary rubber suspension, torsion bar stabiliser
Rear springs:
coil springs, hydropneumatic spring struts, torsion bar stabiliser
Shock absorber front/rear:
gas-pressure shock absorbers
Steering:
recirculating-ball power steering
Brake system (foot brake):
hydraulic dual-circuit brake system with vacuum booster and antilock system;~disc brakes front (internally ventilated) and rear
Parking brake (hand brake):
mechanical (foot-operated), acting on rear wheels
Wheels:
light-alloy wheels
Wheel rims:
7 J x 15 H 2
Tires:
215/65 R 15 102 H
Driven wheels:
rear wheels
Drivetrain:
divided cardan shaft