It depends on how your trans. felt with the oem fluid. Some feel like they shift smoother others really don't. Mine shifted fine with oem fluid and when I changed to Amsoil manual synthetic synchromesh I think it feels pretty much the same, although I feel better knowing it's in there.awesome. Thanks! It was a quart low and I filled it with penz syncromesh. People say it feels like butter after the first change but I havent felt a difference.