I own a 2015 BMW 318d that operates well, with no warning lights or power loss. However, while idling in traffic, it emits substantial smoke from the exhaust, under the hood, and sometimes through the vents. It emits an odor reminiscent to burning oil or petroleum. It is white or gray. It is so severe that visibility behind is obstructed. Subsequently, after about 15 minutes of driving, it resolves, followed by a period of inactivity lasting several days. Occurs only when idling amid traffic congestion.
Tasks I have completed but remain unresolved: EGR valve.
Comprehensive service
PCV measurement
DPF cleaning DPF fuel cleaning agent