1) Certain magazines, slang 2) Ocean pollution 3) Oil leaks 4) Oil spills 5) Oil spots 6) Oily patches 7) Slang, treadless racing tires 1) Mags 
A high-quality proof of an advertisement printed on glossy paper which is suited for reproduction.
A type racing tyre characteristically very wide with no tread.
Racetrack-only tires, so named because they have no tread at all, just a smooth surface so that the
Tires with so little tread that they appear bald. Very fast and grippy.
A treadless tire, used on dry surfaces. Slicks provide maximum contact with the track surface, thereby enhancing grip. In wet conditions, treaded tires are used to dissipate the water buildup between the track and the tire surfaces in order to increase grip.
Slicks are tires which are optimized for dry conditions.
Tires with no tread designed for dry weather conditions.