Just pulling the water pump to head pipe off my 20 valve and there's this gunk in there. It's a semi sludgy yellowy brown colour and it's getting me worried. Just got the engine off SSS about a week ago. Could this just be from the engine sitting for a long time? Or is it perhaps oil mixed in with the coolant?
I've got a couple of pics, but can't figure out how to get 'em up on here.