The oil change interval for synthetic automotive oil depends greatly on the type of oil and the particular make and model of a vehicle. One popular synthetic oil manufacturer, for instance, guarantees its oil to last for 15,000 miles before needing changed.
The reasons for the extended interval, up from the previously touted 3,000 miles, include an increased ability to protect the engine from heat and wear as well as higher tolerances. Some newer vehicles include monitoring systems that keep track of the way drivers use the vehicle and alerts the driver when an oil change is needed. More vehicle manufacturers are using synthetic oils as well.