Quote:
Originally posted by mudphud
Since I'm such a car maintenance newbie, I have to ask some stupid questions...what do the numbers that indicate the oil weight mean? What conditions should you use which weights? Is there a certain time/mileage one should switch to synthetic oil? Are there pictures/instructions somewhere on how to change my oil and oil filter?
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This should answer some of your questions...
http://www.howstuffworks.com/question164.htm
For the last question, I would consider purchasing a Haynes manual for the Xterra at your local auto parts store. Or have one of the local PNWX members show you how to do so on some weekend. It is super easy.