Hello, I wanted to tell you about my 1973 searay you did an analysis on. I had the engine replaced.  When I had some time I took apart the block and found cylinder 4 had one 2 inch vertical crack on the cylinder wall.  It was an open system so I could not see any water missing. I did notice the oil looking like milk chocolate however the lab did not show much water in the oil. Anyway all the other measurements were way too high. Just thought I would update you on my findings. Thanks for your services.