What Is the Difference between Gl4 and Gl5?

Answer

Gl4 and Gl5 are standards set by the American petroleum institute for gear oils. The difference is, Gl4 are intended for axles with spiral bevel and hypoid gears operating under moderate to severe conditions of speeds and loads. While GL-5 is recommended for high-speed loads and also for low-speed torque systems.
Q&A Related to "What Is the Difference between Gl4 and Gl5"
I would assume that you need the GL-5 fluid in the transmission since it is a newer vehicle. GL=4 requirement was for specialized transmissions with brass syncronizers (such as the
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gl4 protects syncros brass bronze etc and hypoid diffs that are part of transmission
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The difference between the Bosch GL4 and GL4Ti is the GL4Ti has a glass lined tank with titanium inside and an 8 year warranty. The GL4 has a glass lined stainless steel tank and
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Specification API GL-4 designates a passenger car hypoid gear and other automotive equipment service, running under high speed and low torque conditions or vice versa. BR's product
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