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I've got a question on another forum.
This person is installing an Eaton limited slip differential, and "Eaton strongly recommends utilizing an API-GL5 approved Mineral-Based 80W-90 Axle Lubricant and one 4-oz bottle of Limited Slip Additive (GM or Ford)."
I know many "synthetics" are group III. What are they, and where can you get them?
Thanks,
Wayne