It is OK to use any oil that has been certified by the American Petroleum Institute for use in gas engines. If you just bought the car I would recommend 5w30 but 10w30 would be OK. Nissan recommends 5w30. My personal choice of brands is Valvoline. It is just as important to use a good quality filter like the Fram Tough Guard or equivalent.
what type of coolant type goes into a 2000 Nissan xterra A mixture of regular anti-freeze(ethylene glycol/polytethylene glyol) mixed with water-- proportion depending on the lowest temperature you will encounter in winter in your area.
The 2003 Nissan Xterra has double overhead cam (DOHC).
The 2012 Nissan Xterra has double overhead cam (DOHC).
The 2011 Nissan Xterra has double overhead cam (DOHC).
The 2010 Nissan Xterra has double overhead cam (DOHC).
The 2007 Nissan Xterra has double overhead cam (DOHC).
The 2002 Nissan Xterra has double overhead cam (DOHC).
The 2005 Nissan Xterra has double overhead cam (DOHC).
The 2001 Nissan Xterra has double overhead cam (DOHC).
The 2006 Nissan Xterra has double overhead cam (DOHC).
The 2008 Nissan Xterra has double overhead cam (DOHC).
The 2014 Nissan Xterra has double overhead cam (DOHC).