What does API GL 5 mean?
The designation API GL-5 denotes lubricants intended for gears, particularly hypoid gears, in axles operating under various combinations of high-speed/shock load and low-speed/high-torque conditions. The performance specifications for API GL-5 are defined in the most recent version of ASTM D7450.
What is the difference between API GL 4 and API GL 5?
The viscosity has no relation with the API Gear Oil Classification and should be chosen based on the recommendations from the manufacturer based on the temperatures where you will drive. The main difference between GL-4 and GL-5 gear oils is the amount of EP additives.
What does API GL 4 mean?
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. … API Category MT-1 designates lubricants intended for non-synchronized manual transmissions used in buses and heavy-duty trucks.
Is gl5 OK for gl4?
Mazda allows GL4 or GL5 and should not be used as a comparison. Most autoparts stores/bike shops/speedshops usually have at least one gear oil that is GL4 or dual rated in the 85wt or preferably 90wt viscosity. If all else fails and you can't find a GL-4, you can always get Royal Purple dual rated GL4/GL5 at Napa.