My first car was a 2003 350z and my second one was a 2007 350z and now i have a nismo 370z. Since my very first car until now I have only ever used Chevron 91 or 93 depending on were i was. Even if i was super broke and couldnt fill my tank all the way up, i still used the good stuff and would fill it up as much as i could. I mean come on man you got a 370z not some Mustang. And really she is worth it. I mean that is why you got her in the first place so treat her right and she will be good to you