Thanks for the replies.

Vehicle has 105K on it. I suspected the thermostat all along. Of course the dealer wants to replace the DPF, because that's what the service tech tells them to do.

I brought it in to the dealer only because a previous recall visit flagged the NOx sensors as bad, and I recently found a communication that BMW NA extended the warranty for NOx sensors to 120K or 10 years. Of course this visit did not flag them as bad, and since their system didn't flag them, no warranty work can be done. I'm sure they'll fail at 120,001.

I cleared the codes and took it on a 2 hour hwy test drive last night and temp hovered in the 135F range (we have an 85mph speed limit on a local toll road here). Eventually, it threw a code for the the DPF filter and one for the thermostat not being to temp (P0128), plus the DPF filter message. That second code seems pretty telling that the thermostat is not right.

Will likely take it to my indie for the thremostat and water pump replace and go from there.

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'10 X5 3.5d, White and Tan
'01 X5 4.4i, Black and Tan, SOLD