Oil in spark plug chamber

[Bala]

Just did a replacement of the 3 driver side spark plugs. Chamber and tube in the rear was very clean. Middle one had some oil and the front one had a little bit. Both the front and middle tubes were looking kind of disintegrated at the connection tip and also were a little more flexible than the one in the rear. I realize I have to change the tubes but what else am I looking at that needs to be addressed? I'll be doing an oil change tomorrow so anything I have to look closely at related to this? Also will be attempting the right side spark plugs tomorrow.