It is a standard IDI Diesel.
Interesting is that it has a crossflow head and has the same features as the 5-cyl diesels, i.e. one belt from the crankcase to drive the camshaft and on the opposite side another belt from the cam to drive the Inj.pump.
Fuel usage: 3.5Litre when doing a constant 90km/h (done once)
5.6Litre when going flat out for hours (done often)
Average for 72.000km: 4,8 Litre, Oil usage 0,8Litre per 10.000km.
Quality of fuel doesn´t matter for this car, it runs on everything. In fact there are quite a lot converted for the use of pure vegetable oil ... www.fmso.de