Mercedes-Benz OM621 engine
Models

Engine
Displacement
Power
Torque
Years
OM621 I
1.9 L (1,897 cc)
37 kW (50 hp) @ 4,000 rpm
108 N⋅m (80 lb⋅ft) @ 2,200 rpm
1958–1959
OM621 IV
2.0 L (1,988 cc)
35 kW (47 hp) @ 3,800 rpm
108 N⋅m (80 lb⋅ft) @ 2,200 rpm
1961–1962
OM621 III / VIII
2.0 L (1,988 cc)
40 kW (54 hp) @ 4,200 rpm
118 N⋅m (87 lb⋅ft) @ 2,400 rpm
1961–1968
OM621 III / VIII
2.2 L (2,197 cc)
40 kW (54 hp) @ 3,000 rpm
118 N⋅m (87 lb⋅ft) @ 2,400 rpm
1966–1988

Question: What displacement version of the OM621 III / VIII engine began being used in 1966, and what year did it stop being used?
Answer: A 2.2 L (2,197 cc) version of the OM621 engine was used until 1988.