Hi Iain,
A bit of history: I bought the Unimog second hand in 1994 from the (French!) army here in Berlin. It was 6 years old (manufactured Sept 1988) with 26,000 km. Motor was and is 366A, original 136 HP/100 kW, 470 Nm; later modified 220 HP/162 kW, 670 Nm. Additionally I mounted a Split...