With regards to the wiper clean there are 2 confusing approaches. One involves removing the lowers etc and yes you need some oil for top up. The other just involves lifting the seals, cleaning and soaking the foam rings with fluid.
see Mojo vid (also this approach came on a leaflet I got with my Trek)
Mojo Vid on wiper seal maintenance
But see service manual for latter approach
Fox manual
Now the manual mentions the need for oil but does not show why. Also the service intervals page points you to the above page.
So which is the right approach?