I used a torque and tightened everything to specs. The nut on the second stud was tight, but in hindsight it did not "feel" right. My guess is over the last 29 years one of the threads down inside the hole must have developed a crack that when torqued on + oil pressure, finally gave out. When I pulled the cover off, the stud came completely out along with the threads from down inside the hole. i believe it was a combination of the two. Brings up another interesting point, my mechanic who has been at this for 30+ years say he knows by feel how tight most of the nuts / bolts should be without a torque wrench. I think if i had been using a regular socket wrench i would have "felt" the cracked thread, but I figured I should just do as the Germans tell me
. Do most people trust that their torque wrenches are accurate enough and follow the service manual specs or do you just tighten by feel?