got a question am running 80 -90 weight in everything should i be running gl-4? everything is diffs all gear boxes overdrive and swivels, read somewhere to run gl-4 because of brass tidbits inside???
thanks
There was a lengthy post on this a little while ago here. Short version: GL5 would be fine everywhere except perhaps the transmission where GL4 may be safer for the synchros.
1965 SIIa 88",1975 Ex-MOD 109/Ambulance, 1989 RRC, blah, blah, blah...
•API Category GL-4 designates the type of service characteristic of spiral-bevel and hypoid gears in automotive axles operated under moderate speeds and loads. These oils may be used in selected manual transmission and transaxle applications.
•API Category GL-5 designates the type of service characteristic of gears, particularly hypoids in automotive axles under high-speed and/or low-speed, high-torque conditions. Lubricants qualified under U.S. Military specification MIL-L-2105D (formerly MIL-L-2015C), MIL-PRF-2105E and SAE J2360 satisfy the requirements of the API GL-5 service designation.
•API Category MT-1 designates lubricants intended for non-synchronized manual transmissions used in buses and heavy-duty trucks. Lubricants meeting API MT-1 provide protection against the combination of thermal degradation, component wear, and oil seal deterioration which is not provided by lubricants meeting only the requirements of API GL-4 and API GL-5.
1965 SIIa 88",1975 Ex-MOD 109/Ambulance, 1989 RRC, blah, blah, blah...
I've been using Lucas Heavy Duty 80W-90 Gear Oil which meets API MT-1 standards in my Rover everywhere gear oil is required for over 3 years and have had no issues.
Jim
Comment