Transmission: 15W50
The "W" on an engine oil bottle is short for weight. A bottle that says 15W50 will have the weight of the oil at 15 at the coolest point and 50 at its warmest point. If oil is too heavy in the colder months, it will gum up and the engine will not turn over to start.
0.7 liters engine oil using Motorex Top Speed 4T 15W50.
KTM recommends Motorex Top Speed 4T 15W50 oil 0.7 L
There is a few oils you can put in a Apache RTC 160. The best oil to get would be Motul 300V 15W50.
KTM says to change the transmission oil the amount called for is 0.7 liters engine oil using Motorex Top Speed 4T 15W50.
KTM reccomends Motorex Top Speed 4T 15W50 (0.7 L)
KTM recommends .5 L of Motorex Top Speed 4T 15W50.
KTM recommends Motorex Top Speed 4T 15W50
My 78, 928 is slightly modified but there is a tube running up from the oil pan which you can see from the front of the engine. the oil capacity is 7.5 Qts. i use 15w50 which my repair manual recommends using. 10w40 in emergency's
First, just try a heavier grade oil. If you're using a 5W15, switch to a 10W30 or even a 15W50. That should help you get some more miles out of the engine.
KTM recommends Motorex Top Speed 4T 15W50.