nobody has responded so I will. That is a crazy swing of indicated temps for certain. Kinda sounds like something within the lines...occassionally blocks the flow of water within.....but I'm not sure either....
your 'collection' definitely qualifies you as a diesel lover!!!! I'm considering a used Range Rover in diesel guise to ad to my Eco....considering the bmw x5d like you have as well.
howdy all ! I bought a '21 Limited eco w/73K this late summer and was amazed at the mileage (lie-o-meter showed 30-32). I'm new to diesel ownership....and I'm puzzled at my last few fill ups ( this is not an everyday vehicle) mileage only in mid 20's (hand calculated)with no change in driving...