Normal running temperature on a E53 3.0D X5

[netercol]

keep in mind that most modern diesels are fitted with a auxiliary element type heater , to actually heat up the coolant if the running conditions are not sufficient to let the engine heat the coolant up, and you want to use the heater inside the car for instance..

diesels can take long to heat up, its all to do with the thermal efficiency of a diesel engine..