Best cold weather manual transmission fluid

As transmission fluid thickens in the cold, the synchronizers in manual transmissions cannot spin as quickly as they need to, which can severely impact the Hey guys, I've got a 2000 Miata which will be my primary car through another Kansas City winter. I'm looking to change tthe manualSAE 75W90, a common rating for manual transmission fluid, has a viscosity of 75 in winter temperatures and a slightly higher 90 rating when it gets hot, and