I adjusted the valve lash on my 292 today and noticed a considerable accumulation of a yellowish jelly like goo on the inside of both valve covers, and it wasn't just a light smearing. There were blobs hanging from end to end. The rocker assemblies and troughs in the heads were clean though. I have also noticed this residue when I cleaned out my road draft assembly. It is not sludge as it is a rather clear jelly  with a light yellow tint. I am thinking it might be detergent condensing out of my motor oil. I have been using 10-30 Quaker State  for all engines. I also have been adding a risolone zinc supplement with each oil change. Does anyone know what this goo is? Is it harmful?