And if you happen to switch to an extremely high detergent oil in an old motor, expect the worst.... There are crucial areas where carbon deposits can become almost friendly. Removing SOME of these carbon deposits can leave us with mosquito control devices instead of motors.
In the long run, nothing beats regular servicing using good quality motor oil and filters. At the very least, performing a PROPER oil change on a regular basis will offer us the opportunity to notice any other problems in their incipient stages. A good lube shop (or a properly performed driveway oil change) will indicated those things that need addressing very soon and others that are impending. This allows us to prepare for the financial hit or avert catstrophic failure.
The choice is yours.... I have what has worked for me for many years (too many years) in both street cars and not so street cars. Copious amounts of fresh, correct oil has been the hands down winner - for nearly 40 years.....