160F shouldn't do any harm with normal street driving, but it's not optimal. The oil is thicker at lower temps and puts more stress on the oiling system, but I haven't heard of anyone having problems with it. As far as I can tell, it doesn't have much of an effect on lubrication, but I haven't seen any tests.
Keeping your engine load and RPMs low until the oil gets warm helps prevent problems.
As others have suggested, blocking part of the cooler during cold weather works well. Anything that will block the wind and not melt will work.
If there is an adjustment on the bypass, try it.
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