I noticed something while changing my oil last weekend. OPlease refer to the attached pic. I noticed there is a nipple or something coming out of the driver's side of my oil filter housing. Is there something supposed to be attached here, like a hose or something? It have a hole going into it, but I couldn't determine if it was threaded or not. Please let me know if all is normal or if something should go in there. Thanks, all!

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1989 300E 144K