Update: Mileage 5850
Just got back and the differential and gearbox actually improved!
As posted to another thread
motul motor oil
I used 8100 Econergy 5W 30 with a Nismo Veruspeed fliter as supplied by Z1 Motorsports on my recent long distance trip. On the first leg I was using 5W30 Mobil 1 and a Nissan OE filter. On my return trip I changed over to Motul and the Nismo Veruspeed. There was a 15 degree difference in oil temp with the Mobil 1 at 220F (max) and the Motul at 205F (max). Both were the same routes and extended duration high speed interstate travel. Good stuff!