Originally Posted by NYBladeZ

Concerning the warranty issue. If you install your own oil cooler and you do a bad install leading to something like an oil leak or ripped line then you are probably on your own for the warranty unless installed by Nissan. However, short of that you should be fine. I can't think of any way Nissan can come back and say that you're install of an oil cooler led to the failure unless you failed to put in the proper amount of oil or did something along the lines of the scenarios I just mentioned. Us 2009's are going to be losing the warranty soon