Rislone oil treatment?

Anyone use it?

I have 300,000 miles on my engine and do notice a lil sludge and valve chatter. I have heard Rislone can help but I have also heard it can work to well and get the gunk broke up so I would have to drop my oil pan after use.

Any suggestions?

Always chancey to try to "de-crud" a high mile engine. If I decide it's worth the risk, I use the product before an oil change as directed, then change the oil and filter again in a couple hundred miles, in case the filter is getting loaded with yuck. The big problem is if it all goes to the bottom faster than it can sift through the oil pump screen, then you got trouble, like you said. I've seen it happen, but that was on engines that were really REALLY hogged up to begin with.(like so bad the oil wasn't returning to the pan fast enough at high rpm)