Rear Diff fluid
01-02-2011, 10:43 PM
#11
Audi Forum - Posts like an A5
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Join Date: Oct 2010
Location: saskatoon, canada
Posts: 366
Re: Rear Diff fluid
Although GL-4 is acceptable, A4 differentials will perform best with GL-5. The GL-4 additives simply do not hold up to extreme pressures as well. Remember that the differential is effectively multiplying the motors torque another four times. At redline in 1st gear, the differential is putting over 4,000lb-ft of thrust to the pavement. You want the maximum protection and engagement here.
FAQ: Rear Differential Fluid Basics
about 1/4 of the way down on the first post lol
01-03-2011, 10:57 AM
#12
Audi Forum - Posts like an A4
Join Date: Nov 2007
Location: South of Heaven
Posts: 117
Re: Rear Diff fluid
GL-4 and GL-5 are not interchangeable though, they have different standards and can cause problems down the road which is why I never use the wrong product. The factory manual ELSA claims that both the differential and transmission (manual) use 75W/90 synthetic oil part number 'G 052 145 S2' which may have been superseded with a service bulletin but that I don't know. If you want to try different brands that is great but you should make sure the specifications of the product you use match the factories or just use factory fluids.
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