Worth pulling /6 to "freshen up"?

Sludge in the bottom doesn't necessarily mean everything's bad. Mine sat up since like 1980 until I bought it and got it running in January of 2019. I did an oil change and replaced one quart with Marvel's Mystery oil. Ran it for about 500 miles and changed it again. Replaced a quart with MMM again. Drove it for three months like that and changed it once more to full synthetic. You should have seen how black the oil was the first time. It wasn't too bad the second. I am still on that third change now. Probably finish the year out with it and change it again. Probably go to a 5/30 full synthetic. I have 10/30 synthetic in it now.