The distinct oily sensation you might notice on your new rug, particularly if it's a man-made polypropylene variety, stems from the oil-based materials used in its creation. When these rugs are freshly manufactured, the residual oils from the fabrication process can linger on the surface. This isn't indicative of a defect or any compromise in quality. Instead, it's a common characteristic of newly made synthetic rugs. Over time, as the rug is exposed to the air and foot traffic, this oily residue naturally diminishes, usually within a few weeks, leading to a more traditional rug feel.