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Change all the engine filters and oil and all the drivetrain fluids including brake fluid. They'll tell you the condition of the internals.
For oil specs and capacities refer to the owners manual but each oil manufacturer has their own lube guides which are pretty comprehensive and match Nissan specs.
Engine Oil: I use Penrite HPR10 10W-40. Changed every 5000k's. I keep looking at who has the 10L drum discounted and buy 2 or 3 at a time.
Oil Filter: Genuine Nissan from dealerships on eBay. Cheaper than ryco from most parts stores.
Air Filter: Genuine Nissan as above.
Fuel Filter: Genuine Nissan. I don't &@ck with fuel filters. Too many bad experiences with previous diesel vehicles and other filter manufacturers.
Pre Fuel Filter: Genuine Fuel Master on eBay from reputable sellers.
Drivetrain: Castrol oils referenced from lube guide.
I did buy and fit DBA standard disc rotors front and rear but I'm not happy with the stopping power. Just bought DBA T3 slotted rotors front and rear. Yet to fit them.