Hi, new to Spec E30, but not tracking cars. Tried searching for this, but could not find anything. Just got a new to me SE30 and the PO said he used Redline 75W90 in the trans. I believe this is a GL-5 fluid, and I think I should be using a GL-4 fluid.
Found some previous postings tha tlisted the three types of fluids based on the trans label, and I believe I have a no label, so Redline MTL seems to be acceptable (not saying the “right choice” because not trying to start a trans fluid war).
Now, I have a bunch of Redline MT-85, which is a 75W85 GL-4 fluid. I use this in my G35, which has soft notoriously synchros and specifies a GL-4 fluid for that reason. It it safe to use MT-85 in my SE30? Or just go with the MTL?