Here are a few reasons why 5W-30 is the recommended oil grade for a 2002 Nissan Xterra:
* It provides excellent wear protection for your engine.
* It helps to prevent sludge build-up.
* It helps to improve fuel economy.
* It helps to extend the life of your oil filter.
* It is compatible with the emissions system on your 2002 Nissan Xterra.
If you are not sure what grade of oil to use in your 2002 Nissan Xterra, please consult your owner's manual or a qualified mechanic.