When changing your vehicles oil you have to replace the oil filter every time you change oil.
When it's time to change the oil in your vehicles engine the oil filter needs changed as well because the oil filter will become clogged or partially clogged.
Your oil filter will also contain old dirty oil and when you change your oil and not change the oil filter the old oil in the oil filter will mix with the new oil.
That is not a good thing and means your engine will get bad oil which can lead to engine bearing failure and possibly cause your engine to have a spun bearing.
Oil filters are cheap and are cheaper than a new engine or vehicle.
I always change my oil filter whenever I change oil and so do oil change places.
A good oil change place will never leave the old oil filter on.
I use FRAM oil filters on my vehicles and for my vehicles the oil filters cost less than $6.00.
That is worth the cost to keep my engine running for a long time.
I change the oil and oil filter on my vehicles engines every 3,000 to 5,000 miles and my engines have 300,000 to 500,000 miles on them.
My truck has 500,000 miles on it with the original engine and transmission and my car has 300,000 miles with the original engine and transmission.