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To add credence to this, I recently changed the diff oil on my Quaife, probably around a year or less after it was fitted. There was loads of metal in the form of a metallic paste on my magnetic drain plug. The distributor said not to bother changing it so soon, but I'm glad I did, and glad I had the magnetic plug, too. Otherwise all that crap would've been washing over the diff. Changed it again about a month later (this last Sunday) and there was barely anything on the plug, confirming that there is a decent amount of wear metals produced during break-in.
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