KTM 450 XC Owner's Manual page 169

MAINTENANCE ON CHASSIS AND ENGINE
Warning
Environmental hazard Problem materials cause environmental damage.
–
Dispose of oil, grease, filters, fuel, cleaning substances, brake fluid, batteries, etc. according to regulations.
–
Place a suitable container under the engine.
–
Disconnect the ground cable
–
Remove screws
600137-10
–
Pull the oil filters
Circlip pliers reverse (51012011000)
–
Completely drain the engine oil.
–
Thoroughly clean parts and sealing area.
600138-10
from the engine.

and . Take off the oil filter cover with the O-ring.
 
and out of the engine housing.
 
167