I'm new to this. I've got a couple of older oil damped forks. A Marzocchi Z5 and a Rock Shox Judy xc, both Y2K. Just painted them and replaced the seals and I need to know if I have to use the mfr's oil or if theres something (motor oil, olive oil, whale oil, massage oil) that does the same thing. If it makes any difference the JUdy is for a 100 lb kid and the Marzocchi will be ridden by his father, a 200 lb kid. And what about Rock Shox butter? Whats up with that? Is it any different from lithium grease? Fill me in. Thanks.