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Im guessing that its a diesel as you havent specified what car it is.
Its pretty normal to see a bit of oil leakage out of the breather pipes when the engines getting on/starting to breathe a bit as they are push fit/poor fit usually.
Wouldnt worry about it if its not using loads of oil and no blue smoke out the exhaust, brake cleaner and wipe it off. Dirty diesel usually mist of oil somewhere.
Sorry yes it is renault clio mk3 1.5 dci only noticed the oil leak on the pipe due to waiting at lights with my heater on and the smell was like burning oil I've not noticed blue smoke checked the oil seems ok could it need a good clean and the egr valve cleaned