gearbox oil

[FMags2@domain.elided]

The PO on my car had completely drained the gearbox while troubleshooting a
speedometer drive problem.  The workshop manual says to use 80W-90 Hypoy,
except if you are filling it up from being completely drained.  In that case,
it says to use 75W Hypoy.  Where can I find some?  I've looked all over
locally, and cannot find any.  I may try a local distributor, but I don't want
a case of the stuff.  Anybody have any suggestions?
Thanks,
Frank M.