I had an oil cooler (GTM kit) and never experience what you are describing. I know some first year Z's had a high pitched sounded related to the ecu but I have never heard of this issue after an oil cooler install.
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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