I would say "yes", but Oil and water don't mix. Unless forced to. So, it's possible that, after sitting for a while, the sludge floated to the top and the antifreeze went to the bottom. (oil floats on antifreeze).So in my original post I mentioned that I'd pulled the bottom hose and the fluid that came out of the block was dark green, no oil that I could detect. If it's a blown head gasket shouldn't there be a similar sludge from the block as well as the radiator?
You reallywon't know what's what until you have a pressure test of the coolant system and/or a compression test/leakdown test done.