My first track day in the Z I did it with out the oil cooler... just the oem oil cooler that comes in the 12+ 370z and I never get in limp mode and I have a lot of fun
... With that said.... after that track day I buy the Stillen 25 rows oil cooler kit and trust me, it was one of the best mods that I did to my Z! Unfortunately a damn rock hit the oil cooler core and I have to take it off
But for sure im going to buy another core hahaha!