Traveling in a straight line on a dry road at around 65mph, the vehicle's engine expired in a huge plume of coolant/oil. flatbedded to a porsche dealership, a technician using a boroscope found (according to the dealership) "scoring to #5 cylinder and evidence that a valve had hit the top of the piston. there was also a huge amount of metal debris in the oil filter." this was a result of something failing in the engine, rather than the cause of the failure. the porsche dealership did not care to determine the cause of the failure. i suspect intermediate main shaft (ims) failure. one year beyond certified pre-owned (cpo) warranty and $20k for a new engine. *tr