Yesterday I put the Redline MT-LV 70W/75W in the Mirage. This new transmission oil is thinner than the OE spec fluid. My engine was still a bit warm, and the oil coming out was still thicker than the oil going in. Also, it was interesting to see that the oil is actually red in color. The OE oil was a like a slightly browned engine oil, but the new oil was... well take a look. I am guessing this oil is much more akin to ATF than traditional manual trans oil.
Initial impressions are that the transmission does shift a little smoother. Ambient temperature was about 65F though, so it was already warmish.
The car currently has 85,002 miles on it. The plan is to send in a transmission fluid sample to be tested after about 5k miles to see how things are wearing. This will likely take me about a year to do since I do not commute very many miles.