Hey everyone, first post. I own a 2003 GT 5 speed. Currently, I'm using Mobil 1 Synthetic ATF. It seems I have a synchro going out in 3rd gear. But it gets noticeable and worse as my transmission warms up, almost like my fluid is getting warm and thinning out. Has anyone ever had this issue, and what is a good transmission fluid I could try that might help? Thanks in advance!