Strange, can you explain how exactly you got that? Explain "open emissions system". Do you mean "swarth" ....a british car term to explain the nasty substance swabbed from inside air hoses, etc?
If so, that's not always a bad thing on engines used for short trips during cold winter weather and yes, especially if the t-stat's defective (engine not reaching proper operating temps). Sure, I wouldn't like seeing that stuff in my cars engine parts either but it's not a major deal if the oil drained during an oil change still looks normal IMHO. If the drain oil looks like that, it's serious.