Hi, the damper cartridge unscrews then dumps oil on you!
Be carefull not to make a mess of the outer alloy body when removing.
Protect with a cloth then get grips on if you need!The complete body unscrews from the front if i remember corectly.
I dont know which oil to use but something lighter than heavier.
But do not over fill as this will screw the feel of the damper and may pop the seal.
Make sure when you screw back together its tight enough not to shake loose as this can happen.
Cheers,Al
ps if you need anymore info pm me.