With stock gearing 80-82 mph
KTM recommends Motorex Top Speed 4T 15W5 (0.7L)
I am assuming you mean gear oil, KTM recommends .7L of Motorex Top Speed 4T 15W50.
90mph
110mph
The Top Speed Is Around 80 mph
60 mph
About 70mph
90mph
KTM recommends Motorex Top Speed 4T 15W50
With stock gearing top speed would be 50-52 mph.
The top speed of a 2009 KTM 150 XC is approximately 65-70 mph, depending on factors such as rider weight, terrain, and maintenance.
KTM recommends .5L of Motorex Top Speed 4T15W50.