In point of fact, API categories GL-1, GL-2, GL-3, and GL-6 were declared inactive (obsolete) by an SAE Technical Committee in 1995, although oils may still be marketed with these designations. Lubricants qualified under SAE J2360 also satisfy the requirements of the API GL-5 service designation. These oils may be used in selected M/T and transaxle applications.ĪPI 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. The API Service rating is completely independent of the viscosity rating, so for example, an SAE 75W-90 oil could have a GL-4 or a GL-5 or even a GL-1 Service rating.ĪPI Category GL-4 designates the type of service characteristic of spiral-bevel and hypoid gears in automotive axles operated under moderate speeds and loads. Protege synchros do not contain yellow metals and consequently, as clearly stated in the M/T section of the FSM, either GL-4 or GL-5 oils are completely safe to use. EP additives are composed mostly of sulfur/phosphorus compounds that can harm yellow metals such as copper or brass that are contained in some synchros. An API Service GL-1 oil contains no EP additives and a GL-4 Service oil contains about 1/2 the additives of of a GL-5 Service oil. The American Petroleum Institute (API) Service rating of a transmission oil refers to the amount of EP (extreme pressure) additives it contains.
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