A rock hitting the oil cooler would be no different that a rock hitting the radiator or the power steering cooler. In fact, Nissan should be glad to keep the warranty with any aftermarket oil cooler since it helps the longevity of the engine. I personally got a Stillen 25r cooler because I never want to have to worry about high oil temps in any condition ever again.

Plus, the additional oil capacity and keeping the oil temperatures down will aid in the longevity of the engine in my opinion while allowing longer oil change intervals.

I know they'll do bolt ons :) .. but will they guarantee the work and keep the car under warranty with the oil cooler installed? Thats the real question.

That pegged my meter! Nissan has made a statement on oil coolers (posted here numerous times) , and that is not true..Maybe they know more than your dealer? Hmmmm...

http://images44.fotki.com/v1356/phot...bsmeter-vi.gif

An oil cooler failure that destroys your engine is pretty much the only time Nissan is going to void your engine warranty.

Nissan has been very coy about intentionally tagging this stateside Nissan oil cooler "competition." Yet, we have already learned that in the Middle-East the 370Z arrives with a factory oil cooler already installed: does my car have engine oil cooler !! PIC & VID inside. You can blame the bloody corporate lawyers for such tomfoolery.