I have a 5 speed manual transmission. I just bought Royal Purple transmission fluid. Is this the best fluid to use or is there something better? Just wanted to make sure before I put it in. Also would it be a good idea to run Royal Purple motor oil or stick with Rotella or Rotella synthetic. Also is the drain plug on the bottom on the tranny the only place I need to drain fluid from? Does the manual trans have a inline filter like the auto trans has? Thanks for the info.