well my e39 530d is manual, its now just on 286 000km, last week one evening i drove to capetown cbd to go visit a friend, as i pulled up on their driveway i heard the aux fan going nuts... about 2 or 3 hours later i left and noticed the temp needle smack bang in the middle, weird as usually the car temp would have dropped a bit...
it was like 12c out.
so on my way home as im on the highway i see the temp needle starting to climb to the red, i switch off, let her cool off... repeat process
eventully some 25km further (which took the best part of a hour to drive)
i got to another friends place (much closer than my home)
left the car there, next day had it towed to garage etc..
turned out my oil cooler packed up and contaminated the entire cooling system with oil.... E I S H