There is a great deal of discussion related to this already in the fortuner thread. Have a look at that. In a nutshell: Get Caltex Delo 400 mgx with 15w40 rating. Or if you could find, go with Mobil Delvac 1 5w40 or Mobil 1 5w40 TurboDiesel. These Mobil oils are IMO the best.
As for routine maintenance. Stick with a high quality wash and wax shampoo like the chemical guys cws 107 or cws 207 and then a good long-lasting wax like like collinite 476 or 845. No need for frequent polishing since this is a brand new car. You may polish if you see a lot of swirls tho. Get a good VRP dressing for that slick tire shine.
I have a similar black 2.8 diesel with barely a few hundred kms done and this is how I'm maintaining it. Cws 107 plus collinite 845 and 476(layering after 24h curing time) for the exterior. Collinite 855 for the interior. Although the shine is not as slick as an expensive high carnauba wax like the pinnacle souveran paste wax, but much much more longer lasting(months) and great shine and easy to clean too.
Will post pictures when I get time iA.