Ive got a 01' Z.3 QR20 that had a crack in the arch upper part, so I switched said part with that of another marzocchi fork I had, broken as well, just not that part. And, of course I had to drain the oil to do this. Its the first time ive really done anything this invasive with a fork and was wondering what type of oil and how much oil do I need to put in it?