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Discussion Starter · #1 ·
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?
 

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I used the Amsoil Synchromesh in my 2012 ECO MT. Change it out every 45K miles.
 

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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?
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.
 

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I've been on synchromesh for the past 35K miles with no issues, and the 1-2 grind virtually eliminated. I will be using it again. As mentioned above, the volume is very important. 2.5 quarts.
 

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I switched to Synchromesh about 70K ago and with 106K and plenty of shifting (not all highway, by a long shot) and numerous hard launches she's still in one tight, quiet piece.
 

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Changed out the fluid last week with 2.5 qts. The grinding issue hasn't come back.
It'll come back in about 40-45K miles. That's when you know it's time to change it out again.
 
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