My e92 335d appears to be running a bit cold - as far as I can make out from comments here and on other forums stating it should be hovering around 90. Mine, according to an app I've got running on my phone (rather than the on-board hidden menu in the iDrive) is sitting around 75-80, barely, and rarely, getting above that.
Should I be concerned about this? I understand it impacts the DPF regen. The same app on my phone is also reporting the amount of soot particles in my DPF periodically dropping back to almost zero every now and then, so I guess regen is working as it should.