2005 BMW 530I Engine Problems

I HAVE LEFT MY CAR AT THE AIRPORT FOR A 2 DAY BUSINESS TRIP. WHEN I DROVE BACK FROM THE AIRPORT, WHILE ON THE HIGHWAY, I SAW A BIG PLUME OF SMOKE COMING FROM THE BACK OF MY CAR. THE ENGINE KIND OF HESITATED BUT DIDN'T' STALL. I WAS ABLE TO DRIVE TO A SAFE PLACE AND CHECK THE OIL DIPSTICK. THERE WAS NO OIL LEFT IN THE OIL COMPARTMENT. WHEN THE ENGINE COOLED DOWN I SAW BLACK LIQUID DRIPPING OFF THE EXHAUST PIPE. THE CAR SMELLED LIKE BURNT OIL. I SPOKE TO THE DEALERSHIP THAT SERVICES MY CAR AND THEY TOLD ME TO TOW IT TO AVOID ANY FURTHER DAMAGE. THE DEALERSHIP IDENTIFIED THE PROBLEM AS A FROZEN OIL SEPARATOR THAT CREATED A VACUUM LOCK AND PUSHED THE OIL TO BURN THRU THE ENGINE AND THE EXHAUST SYSTEM. FROM FURTHER DISCUSSION WITH THE DEALERSHIP SERVICE ADVISOR AND LOOKING INTO...