I'd say bad idea. Stick with regular hot oil changes and you'll be plenty clean inside.
I have no history on my car before my purchase of it. I do know, after having pulled the valve covers, that it was at least subjected to regular oil changes. How? There wasn't any crud or sludge built up on the top of the head, timing chain guides and sprockets looked great for their age too. Don't know if the chain had been replaced at any time, but it looked to be in good shape too.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.