How frequently the engine oil of bajaj ct 100 should be changed and which engine oil is the best for it?

First oil change at about 2000 miles to get all the metal flakes out of the oil left friom manufacturing pluse changin the filter wuld be a good idea too and then i change mine ery 4000 mile but it all depends on the type of bike and the owners manual
Once again the oil is a personal preferance .i prefer servo