NHTSA Complaint #10894166 — 2006 BMW X3

MY BMW X3 HAS HAD ITS ENGINE MOUNT BOLTS SHEARED OFF. THERE ARE NO INDICATIONS OF THE BOTTOM OF THE VEHICLE HAVING BEEN HIT BY ANY OBJECTS. THE VEHICLE'S MILEAGE IS IN THE LOW 90,000 MILE RANGE. AN INTERNET SEARCH REVEALS THAT THIS IS A COMMON PROBLEM HAPPENING TO MANY BMW X3'S, AT LOW MILEAGE. THEY ALSO CLAIM THAT THE BROKEN MOTOR MOUNT BOLTS, COULD RESULT IN A SERIOUS ACCIDENT. THE BMW SERVICE MANAGER, I TALKED TO, INDICATED THAT HE HAS SEEN THIS SIMILAR ISSUES, BUT WAS NOT AWARE HOW WIDE SPREAD THE PROBLEM IS. HIS GUESS OF WHY THIS MAY BE HAPPENING IS DUE TO DIFFERENT THERMAL EXPANSION AND CONTRACTION OF THE 3 DIFFERENT METALS INVOLVED IN THE MOUNTING SYSTEM. THE WAY I DISCOVERED THE PROBLEM WAS THAT THE ENGINE OIL DRAIN PLUG WAS MISALIGNED WITH A PROTECTIVE SHROUD. I HAVE BEEN OCCASIONALLY NOTICING A THUMP COMING FROM THE ENGINE COMPARTMENT. I HAD MY BALL JOINTS AND FRONT-END CHECKED OUT ABOUT A YEAR AGO AND EVERYTHING CHECKED OUT FINE. I SUSPECT NOW, THAT THE THUMP SOUND IS DUE TO THE SHEARED ENGINE MOUNT BOLTS. IF THAT'S INDEED THE CASE, I WOULD HAVE BEEN DRIVING THE VECHILE WITH THE ENGINE MOUNT BOLTS SHEARED OFF FOR ABOUT 1-1/2 YEARS, UNAWARE OF THE ISSUE. THE ENGINE MOUNTS ARE NOT EASILY INSPECTABLE, WHICH IS PROBABLY WHY THE MECHANIC THAT CHECKED OUT MY FRONT END SUSPENSION DIDN'T CHECK THE ENGINE MOUNTS AT THAT TIME.