I don't bother with the dealership at all. I do all my own work. For one, I know it's done right, two, I can't stand the dealership here in town. They're a bunch of morons.
I just use Mobil 1 5W-30 and the Purolator oil filter designed for the GT-R, meaning that it's larger and filters a little more.
Thinning oil viscosity to improve mileage is stupid. The biggest way to improve mileage on any vehicle is to change the way you drive it.
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