Molybdenum..Slick 50...whatever in Gearboxes

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I've had a mooch and done a few searches and find a LOT of conflicting views on the use of Molybdenum / PTFE type additives such as Slick 50 in your vehicle.

Most say "no" to using it with engine oil but in gearboxes the results are less conclusive.

So...anyone got any views or ever tried the stuff? I know my rear diff has a whine and wondered if this stuff might help with longevity etc. :confused:
 
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