Many of today's vehicle manufacturer owner's manuals often highlighted that oil changes should occur from 6,000 to 7,500 miles or more frequently depending on how owners use their vehicle (extremem driving conditions). Extremem driving could be considered around town, stop-and-go traffic. So, the question is, "Should you have your oil changed every 3,000 miles like in the past?" The reality is that it does depend on how you use your vehicle.
Oil, as well as other fluids lose their lubrication qualities in a number of ways. One way is not allowing the engine to get warm enough (hot) in order to "boil out" the moisture that builds up within the crankcase. Other contaminants (gases) are produced and passed through to the oil by blowing past the piston rings. While much of these gases are removed through the PCV system, a certain amount still ends up within the oil. the only way to remove the majority of these cantaminants is to have oil changes frequently, thereby promoting the reduction of engine wear, even with today's engines running tighter tolerances than in the past.
So while some vehicle manufacturers try to position their vehicles as they "cost less to operate" over time by "recommending" longer oil change intervals, the fact of the matter is that severe or extremem driving conditions are still recognized as stop-and-go and therefore, the 3,000-mile oil change frequency continues to be a valid service.