expression, godan verb (-ku)
oil a pan; grease a surface
Used specifically for applying oil or grease to a cooking surface such as a frying pan before cooking. Compare 油をさす, which is more general for lubricating or adding oil.
See also: 油をさす
フライパンに油を引いてから、肉を焼いてください。
Please oil the frying pan before cooking the meat.
油をさす is a broader expression for adding oil or lubricant to machines or food, while 油を引く is specifically for coating a cooking surface.
Compound of 油 (oil) + を (object marker) + 引く (pull, spread). The verb 引く here carries the sense of spreading a thin layer across a surface.