2009 WRX Rear Diff Fluid - Amsoil 75W-90 Gear Lube?
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10-08-2012, 10:37 AM
This is not good for the rear diff nor the transmission as they both spec GL-5. Shifting my feel fine, in fact it may feel much better, but a GL-5 oil contains 30-50% more Extreme Pressure/Anti-wear additives than this GL-4.
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Last edited by bluesubie; 10-08-2012 at
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