Personally just a normal street driver but track Miata made this comment. Lots of ND Miata users have good luck with Amsoil GL-4 75w90 with shifting. Interested in any views on this. The ND Miata had issues with the transmission when first came out.
https://forum.miata.net/vb/showpost.php?p=9664046&postcount=14
https://forum.miata.net/vb/showpost.php?p=9664046&postcount=14
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