What happens if you don’t change your Miata’s diff fluid for 20+ years (107k miles)

[@mitchbican8650]

Many a diff fluids are forgotten

[@thetruthserum2816]

That's so bad, you might want to change it twice. That's the fill port, the drain port is lower. GL-5 for the Diff.

[@alx4526]

Heard that changing the oil can make it run worse

[@immortanautomotive9221]

I don’t believe that