Can I change only the oil filter and extend the life of my oil?
There are also some drivers who believe that they can make their oil last longer by swapping out the filter more frequently. Fresh filters will not hurt anything (except, maybe, your wallet), but they will not extend the service life of your oil. The oil filter is designed to trap particulates - tiny metal shavings, dirt, and other debris - and keep your oil clean. But that is not the major reason that oil needs to be replaced. Thermal breakdown and mechanical shearing from the forces of all the moving parts in your engine degrade the oil over time. Detergents and other oil additives are also used up and no longer perform as they should as they age. A new filter will not rejuvenate old oil.