I recently insisted my BMW dealership check for EGR Cooler failure whilst my car was in for service after coolant went low twice with no warning and with no apparent escape! Coolant pressure test was ok; technician diagnosed egr Cooler failure & the dealership are raising a claim case with BMW even though my build doesn't currently appear on the UK BMW EGR Cooler recall technical campaign!
More info here:
https://www.bmw.co.uk/landingpages/b...e-recalls#gref
And here:
https://www.bmwblog.com/2018/10/23/b...lion-vehicles/
My build is a 2014 F31 320D N47 efficientDynamics auto
My advice; if you're coolant goes low for no apparent reason; take it to a dealership & demand a test regardless of whether your build is on a recall list or not, & fight your corner before anything catastrophic & costly occurs! BMW press release:
https://www.press.bmwgroup.com/globa...86151EN/417072