Well bhai 10w50 is the dream oil unfortunately i was not able to find it anywhere
..This viscosity rating is only available in fully synthetic blends 
But if temp is near 0 then 20w50 would do...Because pour point of 20w50 is nearly -28 degrees centigrade for LM..As a rule of thumb Pour point should be atleast 10 degrees lower than the lowest temperature your ride encounters in climate..
so 20w50 will be fine till -15 degrees C