Sounds like they goofed, especially if you didn't have this problem before. My 2003 3.3L takes only 3.4L of oil, and judging from what was posted earlier, it sounds like some nimrod misread your truck as a second gen Xterra and overfilled the crankcase. (4.0L engine)
Drain off the excess before you blow some seals, and do the basic maintenance yourself. (VERY easy to do on the Xterra) To give you an example, when I first bought my X, I discovered that some idiot had filled the 5 spd transmission with ATF!!!! I only hope that I don't get any tranny problems down the road as a result of this.
If you do the basics on your truck yourself, you get to know it better...just my 2 cents...I won't trust my baby to some moron pump jockey!
Last edited by thumperpaul; 02-12-2009 at 05:23 PM.