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transmission / diff oil replaced
^ Never heard of it!
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Weekend mods: not much, other than I replaced the transmission & differential oil.
I did some reading on the Miata forums, and Redline MTL synthetic is used by many to improve cold shifting because it's supposedly thinner than other 75w90 oils. Should slightly reduce energy consumption too.
Of course I couldn't find any locally.
So I did what I did with the Firefly, which also calls for 75w90 in the transmission: I bought some GM Synchromesh oil (which is also used in 75w90 cars). I compared its viscosity against the old stuff that was in the Miata's transmission, and the GM stuff pours twice as fast. I ended up mixing 50% Synchromesh with 50% synth 75w90 gear oil.
The car no longer has the "hard to get into 2nd gear" problem when cold.
Replaced the diff oil with synth as well.
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EDIT! Oh, I forgot I also did a tiny bit more "lightweighting": took off another 5 lbs or so. (Off the car! The car!)
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