Oberon - Slave Cylinder for Husqvarna 250/300/350/501 & KTM 250-530 (CLU-4000)All hardware parts necessary are included in the kit with full instructions and is ready to fit. About the Fluid: Use KTM Husqvarna approved fluid only. Some models use mineral oil, some models use DOT 4 DONT 5. 1, although the Oberon Performance slave unit will accept either oil without any issues, the stock master cylinder will only function correctly with the fluid recommended by either Brembo or Magura. Please check your fluid cap if you are