Notchy 5th and 6th gear

[ej257gd]

Hello

I just purchased a new 2010 roadster with touring and sport.

I only have 300 miles or so on it.

I've noticed shifting up to 5th and 6th or down shifting from 6th to 5th is really nothcy..

I have not heard any grinding but it is def notchy. (sometime have difficulty getting in to gear.)

Is this something I need to really worry about or is this common for 370z's.

Should I try amsoil mtg maybe?? Any suggestion would be helpful.

Thank you...