I bought a used T-5 at a reputable salvage yard. My wrench and I checked it out and it was installed. I filled it with Mobil 1 gear lube, 75-90w. When it's cold the 4th gear synchro clashes and when it warms up I can feel the gear when I shift into 4th. Kinda rough. The salvage place said to replace the Mobil 1 with ATF and all my problems will disappear. Whadoyathink????

sbr