Any of the Redline oils is a good choice for the Stivo box mate and any competent person can change it for you with minimal charges. As for the crunch, get the clutch adjusted first and see if it improves... if it doesnt after the adjustment and the new fluid then look at swapping it out for something nicer, I always liked the excedy sports one for daily driving with a bit of heavy footness thrown in now and then ;)