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Gary, With no dis-respect for Rod, the manual calls for 90 wt. straight mineral oil above 50 deg. F and 80 wt. straight mineral oil below 50 deg. F. In today�s terms that id GL-1 gear lube. The Massey part number if MF-1103.
It can also be had under the name Dentax by Shell oil. look in yellow pages for a shell oil distributor near you. Also NAPA carries it as part number 65-205 gear lube. If the local store does not have it then they can get it from the distribution center in a day or two. Costs:
Massey - 1103 ~$37/5gal US
Shell about the same
NAPA - $27/5 gallon US. I bought 3 pails this summer.
From Big Dean's pages
Gear Hydraulic Oil Used In the Older Tractors On the older tractor before the 100 series it is recommend that you use the 80/90-weight mineral oil. Massey # M1103. There has been a lot of controversy on the tractor boards about this. Here are my thoughts on this. The Reg. gear oil will work but sooner or later you will probably have problems with using it. The paraffin in this oil will gum up the valves and filter & you will have to tear the pump down to clean it out. It will also build up on the sides of the gearboxes causing more problems later. I have seen this problem so many time though the years. These tractors can use the same oil that the newer tractors use if the hydraulics is in good shape. this oil is Perm-A-Tran 3 or the old number is M1129A. Some people use Perm-A-Tran 3 in the winter & switch to the M1103 in the summer. If the oil is still clean with no water in it you can save it & reuse it.
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