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I don't know. The oil in mine broke down in only 17K miles if I remember correctly.
Maybe Dana failed to add the Friction Modifier, or the FM was found it quieted the rears down after complaints? I do know Dana will use the least expensive oils they can unless the customer specifies a particular oil. Dana had a bunch of bad rear ends built (the whine issue). The first step in trying to correct the whine was to replace the oil with synthetics with the FM.
I am suspecting when Dana built the "good ones" after the warranty replacements began, they didn't change the oil used. (my opinion).
One day all the sudden after roughly 17K miles on the new rear the clunking began. The FM is liquid gold.
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