ND Miata Manual Transmission and Differential Fluids for Track Use

https://bobistheoilguy.com/forums/threads/mega-75w-90-testing-thread.378175/

Take a look at the 75w-90 mega testing post. Amsoil severe gear pro: best shear stability con: oxidized quickly. HPL Diff life pro: best oxidation resistance con: some shearing

The million dollar question, how much track abuse is equivalent to those bench tests? Your diff may or may not get hot enough for Amsoil’s low PDSC time to matter. Only way to know is to send a sample off for analysis after running it.
 
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