Changing oil without also changing the filter is like taking a bath and putting the same dirty socks and underwear back on that you were wearing before the bath. If anything, you'd be better off changing the filter and not the oil. It collects the trash.
If you change oil, also change filter.
Forget all of the "extended" non-sense being sold these days. It's nothing more than marketing hype used to sell cars. If your plans for the car are short-range, then you can follow the new philosophy; otherwise, do as Larry Bible has often advised.
1991 300-SEL - Model 126
M103 - SOHC
James Madison - Oppressors can tyrannize only when they achieve a standing army, an enslaved press, and a disarmed populace.
Liberty Firearms Training - After years of trying to regulate California criminals with a never ending stream of gun control laws they have still not given up with the belief that if they make something a crime that criminals will miraculously start obeying the law.