What are your oil temps during your daily 80 mile drive? Do you see the temps jumping way too high? I'm still breaking mine in but if I'm just driving I average 195-200 degrees and it doesn't budge. Highest I saw was 250 degrees in the mountains and I pushed it a couple times. It's interesting that while going uphill the temp climbs up pretty quick even if driving gentle. Going downhill it cools very quickly.
The dealer is just trying to make $. You have a warranty and if you're not abusing the car or tracking it don't worry. If you pop the engine you have a warranty and the claim could be denied if you have the oil cooler installed. Seems like a no-brainer and you can save some $.
If you're maintaining your car properly (sounds like you are) and driving normal with some spirited driving but not bashing on the track...let any oil related breakdown be Nissan's problem, not yours.
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