What is "oilless"

Usage examples of "oilless".

With the last horsepower in his hot, oilless engine, he glided between a 5,000-foot mountain on his right and a 2,000-foot foothill to his left, skimmed across a narrow beach, leveled off, dropped his flaps and skittered onto the surface of the bay a couple of miles offshore.

He discovered a bolt, which he drew back with an oilless screech, a security chain, which he let fall with a rattle, and a Yale lock, which he turned without trouble.