I ran a search on the forum and found the following topic that discusses Cerma.
http://www.peachparts.com/shopforum/showthread.php?t=219642&highlight=cerma&page=2
I just recently put this stuff into my 79 US spec 6.9 and was also quite surprised at how much smoother my engine ran afterward. M-100 engines are not really that smooth in my experience so it was noticeable.
Has anyone else tried it?