I switched to Red Line 5W-30 (full synth) at 3k. I have another 6 bottles ready for the next change. I switched to the K&N filter over the stock Nissan one. When I did my first oil change I also got a EOA )Engine Oil Analaysis) of the Nissan ester oil that came with the car. The report essentially told me that I could have gone a little further with it so I don't think there would be a problem with running over 3k a bit.
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