diff/tranny oil question
I was under my car today running the siphon putting some 75w90 redline oil in the diff. When my dad changed the bottle (it took 1.5 bottles) he grabbed a bottle of redline mtr instaed of the 75w90.
In total there was maybe 200ml of the mtr that went in mixed with the 75w90 before we realized the mistake and got the correct bottle. As far as I can tell, the only difference is that one is a gl-50 and one is a gl-40 oil. Is this gonna be a problem, like should I drain the diff and put in new oil?