I've got a dead injector in cyl 6.  I'm still on the fence between DIY'ing this and paying a mechanic.   In any event, I have a couple questions: 
  
It looks like I have to pull the entire rail (all six injectors), which means pulling the intake manifold.  If I do this, do I have to replace the intake manifold gasket and all six o-rings on the injectors? 
  
Several of the posts mentioned oiling the o-rings.  I used to just use a light dab of motor oil, is that still acceptable? 
  
Anyone know the torque specs for the upper intake manifold bolts?