Difference Between Gl 3 And Gl4 Gear Oil

Millers classic gear oil ep 80w90 gl4 and millers classic gear oil ep 140 gl4.

Difference between gl 3 and gl4 gear oil. The designation api gl 2 denotes lubricants intended for automotive worm gear axles operating under such conditions of load temperature and sliding velocities that lubricants satisfactory for api gl 1 service will not suffice. They re usually used for manual transmissions which are operating under moderate to severe conditions. There are many formulations of gl 3 oils in the market some with sulfur phosphorous additive and some with zinc phosphorous. Sulphur phosphorus containing products are used as ep additive.

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. There are many formulations of gl 3 oils in the market some with sulfur phosphorous additive and. Gl 3 it should be noted that while gl 3 is frequently considered obsolete since it has less protection than the gl 4 some transmission manufacturers today specify gl 3 chrysler and mitsubishi among them. These oils are used for manual transmissions where the qualities of a gl 1 or gl 2 oil won t suffice but aren t quite requiring the amount of load that a gl 4 oil can handle.

Gl5 specification is for highly loaded hypoid differentials as fitted to most cars from 1960 onwards. The main difference between gl 4 and gl 5 gear oils is the amount of ep additives. Although api gl 3 oils are considered obsolete as they have less protection than api gl 4 oils some transmission manufacturers may still specify an api gl 3 gear oil. There are many formulations of gl 3 oils in the market some with sulfur phosphorous additive and some with zinc phosphorous.