T4R newbie questions

Just bought a 04 T4R SR5 V6 4wd w/3rd row

What maintance is needed when you hit 100k?

There is no schedule maintance list in the owners manual.

I see a tag saying antifreeze needs changed at 100k



What is up with the second air filter behind the replacement. Does it need changed and how does it come out?



I have the engine tick on driverside when up to temp. I seen alot of info about this. I check manifold bolts and all are tight. How worried should I be of this?



Can I run with the plastic engine cover off? and does it help with heat soaking of engine?



I sold 3 cars to get into this one. When We bought are HL a year ago I knew the T4R was going to be are next vehicle.