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I usually recommend Synchromesh for stock cars and 75W-90 GL-4 for tuned cars. I recommend 75W-90 GL-4 where people have 1-2 shift grind issues. I recommend Synchromesh where the weather gets quite cold for much of the winter (below 0 F). Both will work, and I've swapped back and forth repeatedly.I have a 2011 cruze eco MT and I've been looking on the forum to troubleshoot some grinding and notchiness issues I have. I'm not sure which fluid to use, it seems like every thread uses these terms interchangeably. Do I need the AMSOIL 75W-90 GL-4 or the AMSOIL Syncromesh 5W-30?
It'll come back in about 40-45K miles. That's when you know it's time to change it out again.Changed out the fluid last week with 2.5 qts. The grinding issue hasn't come back.