From the Super Mario Wiki
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Oil Slicks are uncommon obstacles in the Mario Kart games. They primarily appear on standard road tracks, such as the Mario Circuit courses from Super Mario Kart, and cause the driver to spin out when he runs over them. As they are rather small and often placed at the edge of the road, avoiding Oil Slicks is not very difficult. Players can also jump (using a Feather) or hop over them. They appear in all but the first Mario Circuit in Super Mario Kart. The Oil Slicks return in Mario Kart Wii (in SNES Mario Circuit 3) and in Mario Kart 7 (in SNES Mario Circuit 2). It doesn't return in the courses appearances in Mario Kart: Super Circuit.