8k is way too far between oil changes. Although even then the amount of wear would depend on many different factors. When they say crank bearings they probably mean both rod and mains.... I assume your engine is knocking then. This can definitely be fixed without a full replacement. Are there bronze metallic flakes in your oil?
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2009 370z #206 (all mods are Home Depot)
2009 Ducati 848 (full Ohlins, Termignoni, etc)
2003 Grand Cherokee (long arms, big tires, 4.56, lockers)
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