I replaced the passenger bank plugs last night. I'm not using a torque wrench and never have for plugs. I've done a number of I-6 engines without trouble. I found that two plugs didn't really want to seat firmly. It seems as if the torque force would linearly increase instead of the abrupt stop that I'm used to feeling. I didn't cross-thread anything. The old plugs were stamped NGK BMW and were either original or dealer-installed at Inspection II. I had a sinking feeling so I pulled one and it looked ok. The threads were hard to see but I'm afraid they may be "knackered" as some of our British members would say. I started the engine and all is fine, no leaks or rough idle. So I have three questions: Is this normal for the S62? If a thread is stripped, short of pulling the head is helicoil a solution? Anyone been there? Thanks. Off to the driver's side.