160 really is too cold. You can either try fabricating a shield in front of the cooler which has worked for some, but realistically getting a thermostatic sandwich plate and swapping it out will be the best method.
It bypasses the cooler until the temperature of the oil comes up. Too large of a cooler can overcool the oil as well, and the Nissan cooler is large. Oil that isnt up to temperature is also bad, and should be remedied.
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