2003 BMW E36 Power Trainautomatic Transmissiontorque Converter Problems

MY 2003 BMW 330I HAS 85K MILES AND IS IN VERY GOOD CONDITION. RECENTLY, HOWEVER, A "SERVICE ENGINE SOON" LIGHT CAME ON. THE DEALER DIAGNOSED A PROBLEM AND INFORMED ME THAT I NEEDED A NEW TORQUE CONVERTER BECAUSE THE GASKET WAS LEAKING, HOWEVER, THE CAR WAS DRIVING JUST FINE. THEY TOLD ME THAT IF I DIDN'T REPLACE IT NOW THEN DOWN THE ROAD THE WHOLE TRANSMISSION MIGHT FAIL AND NEED REPLACEMENT. I FEEL RIPPED OFF HAVING PAID $3,000 FOR A TORQUE CONVERTER ON A CAR THAT DROVE FINE. AN INDEPENDENT MECHANIC TOLD ME THAT IT'S A COMMON PROBLEM THAT BMW IS AWARE OF, BUT THE COMPANY REFUSED TO HELP OUT WITH THE COST, STATING THAT THERE WERE TOO MANY MILES ON MY CAR. THE LIFE OF THE TRANSMISSION IS SUPPOSED TO BE WAY LONGER THAN 85K MILES. TOO BAD, BMW SAID. *JB