I recently went to change my oil and the oil was very milkshakey. I know there are numerous posts on this butto me it seemed to have gas mixed in as well because the mixture was very consistent and obviously smelled like gas. but the water and oil weren't seperated like I thought if it were just water and oil. I recently replaced the riser and am in the process of replacing the manifold. To me the manifold didn't show any obvious answers nor did I see any cracks on the engine block. I don't think freeze damage is a suspect just because it has always been stored in a garage. stumped