ENGINE SEIZED AT 65MPH HIGHWAY SPEEDS DURING COMMUTE TO WORK ON BUSY BOSTON HIGHWAY. NARROWLY AVOIDED SEVERAL COLLISIONS AS VEHICLE COASTED TO STOP. VEHICLE WAS PURCHASED NEW FROM A BMW DEALER THREE WEEKS AGO AND HAS LESS THAN 2,000 MILES ON IT. DEALER ADVISES AN "OVERSIZED BEARING WAS FOUND IN THE ENGINE CAUSING IT TO OVERHEAT AND SEIZE". ENGINE REQUIRES REPLACEMENT. TRANSMISSION, TRANSFER CASE, ELECTRONICS AND COOLING SYSTEM DAMAGE ARE SUSPECTED BY THE DEALER TECH AND WILL REQUIRE MONITORING.