[29 Tudor]

I used to be a believer in STP until a friend of mine that runs a machine shop told me that when added to the crankcase, a portion of it settles to the bottom of the pan and NEVER "dissolves". He said he had seen it in many motors. Well, when I pulled the pan on my 427, there was 1/4 - 1/2 inch of very sticky "stuff" in the bottom of the pan. I have worked on many engines an never saw that kind of deposit before. Needless to say, I don't use it anymore in the crankcase. I have used it to pre-lube the mains and rods during a rebuild.

SD