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Are all full synthetic rear differential gear fluids made equal?
https://www.api.org/-/media/Files/Certification/Engine-Oil-Diesel/Publications/1560-Eighth-Edition-April-2013.pdf If you read the reference from API, you will see that the specification is impossible to certify. It is an obsolete specification, as there is no way to actually test to the GL-4...- 4MUL8R
- Post #42
- Forum: ATF, Differential, Trans, Brakes, P/S
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4
Are all full synthetic rear differential gear fluids made equal?
There is a big difference between GL4 and GL5 specifications. Do not use GL4 lubricants where GL5 lubricants are specified. Insufficient EP protection in GL4 will potentially harm any hypoid axle gear. Insufficient antiwear protection in GL4 will potentially harm axle gears and axle gear...- 4MUL8R
- Post #39
- Forum: ATF, Differential, Trans, Brakes, P/S