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bosch spark plugs loosening
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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...
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