Does nismo 370z come with different engine?

atl370z

Took wify's speed3 in for smoking turbo problem. The service rep told me that to get rid of the smoking issue, you as the owner need to start using synthetic oil. I was like WTF?? One, you are not going to fix the dang turbo and two you ask us to just deal with ourself? He also said that you got a sporty car and it requires synthetic oil and you got to pay to play(who in their right mind say that to the customer?). So I said "but my 370z does not require synthetic oil" He then ask me "did you get the NISMO because it's a different engine" I told him it's the same!!! and thats not what he heard. At the end of the day, all the sales dpt side were really nice and the service dpt were bunch butt holes. Now, we have been in and out of the dealer for the same problem for over 5 times already and we have decided it's time to move on and look for somthing else. So, what can we get that is fast, fun and practical at the price range of $18000