Here is what my old trans fluid looked like...
old MTF-LT-4, new MTF-LT-4, new Redline ATF-D4
DIY: manual transmission and diff fluid change
When I switched from LT-4 to Redline ATF-D4 I noticed my manual trans shifted much smoother. Easpcially on a cold 1st to 2nd shift. Not totally perfect... but MUCH better than with the OE MT-4 bmw fluid.
The Best oil is Fresh oil!!!