I don't work Saruday mornings.
No, because I know what I'm doing, I change my own oil and have a look around while I'm doing it.
Manufacturers give you an o-w-n-e-r's m-a-n-u-a-l. Read it and follow reccomendations.
Obviously, their a-n-a-l-y-s-i-s has shown that oil needs to be changed at
7,500, but dweebs like you disregard it and cry about sludged engines.Twerp.