2000 Toyota Sienna Wheels Problems

FRONT PASSENGER WHEEL STARTED TO VIBRATE. AFTER APPROXIMATELY 1 MILE, ALL (5) WHEEL STUDS SHEARED OFF, AND WHEEL FELL OFF OF VEHICLE. LUG NUTS DID NOT APPEAR TO BE LOOSE PRIOR TO STUDS SHEARING.*AK

TWO TIMES I ROTATED THE TIRES AND THE LUG NUTS CRACKED IN TWO. SOME FILL REAL SPOUNGY. I WENT TO TOYOTA DEALER BUT THE WOULD NOT REPLACE THEM, THE SAID THEY WERE TIGHTED TO MUCH. IN 25 YEARS WORKING ON CARS I NEVER SEEN LUG NUTS BREAK. SO I PURCHASE NEW ONE AND RIGHT AWAY I NEW THEY WERE BETTER. SO I SHOWED THEM TO THE SERVICE MANAGER, HE STILL SAID THERE IS NO PROBLEMS. I SAID THERE MUST BE, THE NEW ONES ARE BETTER (MORE THEADS, WT. MORE, & BETTER STEEL ) ALSO TWO LUG NUTS BROKE TAKING THEM OFF.*AK

THE CONSUMER STATES ONE LUG NUT ON TWO TIRES HAD BROKEN AND SHEARED PARTIALLY OFF. THE CONSUMER WAS ROTATING THE TIRE WHEN THE PROBLEM WAS FOUND. THE DEALER WAS NOTIFIED AND HAD NO KNOWLEDGE OF OTHER FAILURES. THE LUG NUTS WERE REPLACED.*JB.*JG

1 WHEEL BOLT SEVERED WHILE TRYING TO REMOVE LUGS: NUTS. 1 WHEEL BOLT SEVERED WHILE TIGHTENING LUG NUT. BOTH BOLTS FAILED ON THE SAME DAY AND WERE BEING WORKED ON BY DIFFERENT PEOPLE.*AK

3 OUT OF 5 LUGS ON ONE WHEEL SHEARED OFF WHEN REPLACING TIRE. MECHANIC CLAIMS TO HAVE USED TORQUE WRENCH SET WELL BELOW FACTORY SPECS. NOT CLEAR WHETHER LUGS ARE DEFECTIVE OR MECHANIC OVER-TORQUED. LUG NUTS ARE DESIGNED FOR MAG WHEELS BUT SPARE IS NOT A MAG. APPEARS POSSIBLE THAT USING THESE NUTS ON A STANDARD WHEEL RESULTS IN NUTS BEING SWAGED ONTO THE LUGS SUCH THAT THEY SUBSEQUENTLY FAIL. MEACHANIC REPORTS THAT THIS HAPPENS ABOUT ONCE A MONTH ON THIS VEHICLE AND MUCH MORE FREQUENTLY ON SIMILARLY DESIGNED ISUZU LUG NUT.*AK