I think a good high quality detergent oil already has that in it.
The biggest problem in switching from non-detergent to detergent oil is that the engine will start to leak as all the junk sealing up the gaskets is removed.
Most of our stovebolt engines have been running detergent oil for decades anyway, as this is what is most commonly available. If you are worried about it, I would take off all the covers, clean up what you can including the oil pickup screen, and run detergent oil.
Kurt
