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According to the techs I've spoken to, this is not uncommon on the N5x engines. As noted in post #2, the potential effects are catastrophic. As the pulleys - tensioner or idler - are the usual cause, the general recommendation is to check for any displacement of the belt on the pulley at every oil change. If the belt is not 100% centered on the pulleys, replace it, the tensioner, and the pulleys immediately.
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Life's tough. It's tougher when you're stupid. -John Wayne
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