Divider plate

[mariner man 66]

I was doing a compression check today on my v6 135. I found that it was a bit low at 100 in each pot. I decided to spray same oil into the cylinders to see if this would help. as I had all the plugs out I noticed as I was spaying the oil in (with spray gun hooked up to air compressor I noticed that this oil vapour was coming out of the cylinder on the opposite side. Does this mean that the divider seal behind the exhast cover is gone??