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At the 1991 Geneva Motor Show Mercedes-Benz presented the S-class 140 series as the successor to the 126 series in production since January 1980. The further developed 6-cylinder in-line engine with 4-valve technology constitutes the lower end of the power plant range. Displacement has been enlarged from 3 to 3.2 litres. In the course of further optimization of the gas cycle, the familiar light-alloy cylinder head with 4 valves per cylinder has been provided with modified timing diagrams and redesigned intake ports. As a result, it has been possible to achieve an over-proportional increase in maximum torque. The maximum power output of 170 kW remains unchanged. Engine speeds have been significantly reduced: Engine speed at maximum torque from n=4600 rpm to n=4100 rpm. Engine speed at maximum output from n=6300 rpm to n=5800 rpm.