The clutch M/C (with the green cover) takes a special low-viscosity mineral oil, not the stuff you buy in the drug stores. You can get it from your GasGas dealer or off-road bicycle shops often carry the special mineral oil used on mountain bike brake systems, Like Magura Blood or Royal Blood. Do NOT use Dot 3/4/5.1 in the clutch. You can also use Dot-5 (Silicone) in the clutch without changing the seals/o-rings if you completely flush all Dot-3/4/5.1 out beforehand. The Dot-5 will give a little