Lauri,
In my experience even oil condition is not a good indicator for the condition
of the
overdrive, (although oil with brass specks is a very bad sign).
Basically to know if the overdrive hasnt been abused, you have to pull the OD
unit apart
and inspect the sun, planets and anulous gear faces, and also the planet
bearings since
this is a common sign of failure. Look also for heat discoloration of the
planet carrier
this indicates the bearings have been very hot before.
HTH
Jarrid Gross
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