believe me the R380 box is very "squeamish" when it comes to oil, as i didnt find MTF94 locally i tryed many kind of oils, even Castrol Syntrans Multivehicle which they said is an alternative for MTF 94 but was hard to select 1'st and 2'nd especially when cold, also i used all kind of additives just to make it better... ended up by ordering MTF94 from UK then i was able to select all gears with two fingers even at -20*C ...i kept the other oil for diffs cos it will be good at least for those
IMO that "MTF GL4" is some cheap sh*t generic manual transmission fluid which would be good for trucks and tractors...use the STC9158 (rover mtf 94) if you want soft gearchange