The only service manual recommended for any owner is the one downloadable in Acrobat format for a one day subscription from
http://www.nissan-techinfo.com/infiniti/
Be sure to get all the TSB also. You must have a broadband connection or lots of coffee.
I suggest you also do searches and read through the previous posts to learn about your car. Any G50 owner must read all of Q45tech's posts to have any understanding of how to maintain this car, or many others for that matter. Take your time and you will be rewarded.
The 1996 G50 is an odd bird in that it is the only G50 with OBD II.
Welcome to the board. You have found the best source of information for Infiniti maintenance.
Modified by maxnix at 12:12 PM 9/13/2004