This is an old topic but Nissan already replied to this argument. They said they didn't put an oil cooler to keep the price affordable. That for normal public driving they don't think that will be a problem but if there is high temp problems that's why the computer protect the engine with the limp mode. So that is the protection Nissan installed.
But they also replied that for track enthusiast people to go ahead and buy an oil cooler.
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