Hey Westm, yep there are 4 intakes, you can see the last one cutaway in the 3rd pic.
I used Motul mineral fork oil, which was $20(AUD) for 1 litre (all you need for both forks, they take around 450ml a leg). You can go synthetic for about $30.
I went to 15w because the forks were diving too quickly under heavy braking for my tastes, but more importantly the forks were compressing and rebounding too quickly. BTW I weight 80kg.
This is a simple stop-gap to slow the action of the forks. I love the difference, but I'm far from finished. I plan on having the internals completely overhauled (as well as the rear shock) because if you're going fast on bumpy road (they all are here in NSW!) then the suspension on this bike is an absolute shocker, pun intended. I rode 650km yesterday and on the fun stuff, I was constantly battling with it.