Depends on the brand. Fox 4" air bumps standard oil volume is 125cc I believe. I believe SAWs are the same. They take shock oil like air shocks or COs.
Depending on how you want to set them up you can run a little more or a little less. The standard charge should be 200 psi but we typically run them a bit lower.
I keep a 5gal bucket of Shell T22 oil at the shop. That is what I was told to use to rebuild them with and it works great. If you need some I can bring it to you fri.