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  1. E39 (1997 - 2003)
    Why would Bosch spark plugs be prone to loosening & backing out & needing timeserts? Why would Bosch spark plugs (reputedly) seem to be loosening up (causing them to eventually blow out of the engine, taking the threads with them) purportedly more so than NGK or BMW OEM spark plugs? A thread...
  2. E39 (1997 - 2003)
    Was replacing OFH after doing gasket replacement. One hole turned out to be stripped. It is the upper bolt hole with the metal guide for the housing. Was going to do a helicoil but turns out the guide sleeve ID will not permit the driil and subsequently the tap for helicoil to pass through so I...
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