http://www.finalube.com/reference_ma...Categories.htm
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Service Designations Not in Current Use
Due to changes in manufacturers' recommended practices and the unavailability of proper testing hardware, the API Service Designations GL-2, GL-3 and GL-6 are no longer in current use.
GL-2
This designation denotes lubricants intended for automotive worm-gear axles operating under such conditions of load, temperature, and sliding velocities those lubricants satisfactory for API GL-1 service will not suffice.
Products suited for this type of service contain anti-wear or film-strength improvers specifically designed to protect worm gears.
GL-3
This designation denotes lubricants intended for manual transmissions and spiral-bevel axles operating under mild to moderate conditions of speed and load where service conditions require a lubricant exceeding those satisfying API GL-1 service but below the requirements of lubricants satisfying API GL-4 service.
Gear lubricants designated for API GL-3 service are not intended for axles with hypoid gears. Some transmission and axle manufacturers specify API Category "CC" or "CD" motor oils for this service. The manufacturer's specific lubricant quality recommendations should be followed.
GL-6
This designation denotes lubricants intended for gears designed with a very high pinion offset. Such designs typically require protection from gear scoring in excess of that provided by API-GL-5 gear oils. A shift to more modest pinion offsets and the obsolescence of original API-GL-6 test equipment and procedures have greatly reduced the commercial use of API-GL-6 gear lubricants.
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GL-4
This designation denotes lubricants intended for axles with spiral bevel gears operating under moderate to severe conditions of speed and load or axles with hypoid gears operating under moderate speeds and loads. These oils may be used in selected manual transmission and transaxle applications. The manufacturer's specific lubricant quality recommendations should be followed.
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Basically, you can use GL-4 in place of GL-3, but not the other way around. Previous Lancers also called for GL-3, but run great on high-quality GL-4s.
