I've had a mishimoto oil cooler on my car for several years and have never had an issue (knock on wood). I got the cooler brand new for $200.00. It was an open box sale. I was sceptical about it, but its held up well. Keep in mind though my Z is a 2009 with only 25,000 miles. I drive it infrequently and have only tracked it twice at Road Atlanta during the Z Nationals. With that being said, if you decide to use it, I would highly recommend installing an oil pressure gauge and not utilizing the mishimoto thermostatic oil sandwhich plate.
Overall it works well. During the summer heat it keeps the temp between 180 and 200.
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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