Reply To: Drained Gear Oil

[olcah]

Thanks also Matthew and Crosbyman,

I did replace all seals in that gearbox about 4 years ago including the shift shaft and prop shaft.  However when I do that job many times I find that the seal surfaces on the shaft are worn/damaged.  I usually just put the gearbox and new seals back together and expect that there will be some leakage.  Probably should learn to pressure test but if the shafts are imperfect I’m not sure of the value.  Usually I just change the oil 2 or 3 times per season.  I would appreciate learning  if anyone has a better way.

Not much info on the WalMart Lube:  Super Tech Marine lower unit gear lube SAE 80W-90.  “Use where API GL-5 is specified.”  About $7/quart.,,