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GL3/GL5 Gear Oil Ratings
GL5 gear oils can attack the yellow metals found in manual transmissions. GL5 gear oils are recommended for differentials. GL3 is safe for the yellow metals, and should be used in transmissions. GL3 fluids should not be used in the differentials.
 
Related Writeups: | Manual Transmission Fluid Change | Changing Differential Fluid |
 
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