When we buy and drive any two wheelers or four wheelers, one of the most critical things for the maintenance comes in our mind is how frequently we have to change oil of our vehicle? This is actually very common question, which comes in anybody’s mind. The answer of this question, which we regularly hear is, we have to change oil in every 3000, 5000 or 7500 miles or when we take the vehicle for servicing isn’t it? But these answers never satisfied the customers and they are still confused about the matter. Well, but actually there is no simple justification, because all these queries depends on the weather condition, driving style, roads and various other things, which affect the vehicle.