2004 xterra 6cyl 3.3L (160k miles) & 2003 xterra 6cyl 3.3L (dead engine)
is it bad if you don't use any? I did not use any when I put it back together the 1st time and the o-rings were in good shape then. when I pulled it back apart the o-rings looked worn and not in good shape, a few even had some tear/snag spots... was this my doing by not using any lube when installing them?You can use silicone lube. Just don't use a ton. It's just to help reduce friction as you slide the injectors in. Basically the orings should be shiney after it's applied, but there shouldn't be gobs hanging off. Also be careful to not get it on the orifice or the the filter screens.