If you don't track you're vehicle, it's not necessary.
For simple daily driving, you should be fine w/out one, otherwise Nissan would've already recalled our vehicles by now.
FYI before you get some angry posts, there are a million threads regarding oil coolers. Use the search option and you'll find lots of information and opinions.
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2009 PG 6MT Sports Stillen Gen3 CAI | Stillen CBE | AMS Short Shifter | Nismo Brace Kit
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