2006 Volkswagen Jetta Fuel System Diesel Power Train Engine Fuel Propulsion System Problems

MY WIFE AND I WERE DRIVING HOME AND SUDDENLY MY CAR STARTED JERKING AND MADE A "KNOCKING" SOUND, WITHOUT ANY WARNING (I.E. CHECK ENGINE LIGHT). WE WERE CLOSE TO HOME AND DECIDED TO CONTINUE ON; HOWEVER, IN THE NEXT COUPLE OF MILES, THE PROBLEMS PERSISTED, STILL WITH NO CHECK ENGINE LIGHT OR ANY INDICATION OF WHAT WAS WRONG WITH THE VEHICLE. OVER THE NEXT SEVERAL DAYS, WHILE PARKED ON A SECURED PREMISE, I STARTED THE CAR UP AND IT HAD AN ERRATIC LOPING SOUND. I PROCEEDED TO CALL A NEARBY VOLKSWAGEN DEALER AND SPOKE TO TWO CERTIFIED VW MECHANICS, WHO FAILED TO ACKNOWLEDGE THE ISSUE THAT THERE WAS NO WARNING INDICATION BEFORE THE CAR STARTED TO ACT UP AND SAID TO BRING IT IN TO SWAP OUT THE ENGINE AT APPROX. $7500; THEY DISMISSED THE PROBLEM AS "NORMAL WEAR AND TEAR". I RESEARCHED THE PROBLEM ON THE INTERNET AND IT LEAD ME TO BELIEVE THAT IT WAS A PROBLEM WITH THE CAM, WHICH I HAD CONFIRMED BY AN AUTO-MECHANIC AFTER TOWING THE CAR IN. HE TOLD ME THE ENTIRE ENGINE WAS WARPED DUE TO THE CAM GOING OUT. OTHER 2006 VW JETTA TDI OWNERS HAVE COMMENTED ON THE SAME ISSUES, WHICH AT THIS POINT LEADS ME TO BELIEVE THAT IT IS NOT "NORMAL WEAR AND TEAR", BUT A MANUFACTURE DEFECT. *TR