greaser vs oiler

greaser

noun
  • A Latin American, especially a Mexican. 

  • A mechanic. 

  • Someone or something that greases (applies grease). 

  • A biker, a tough. 

  • A rocker or metalhead, especially one who listens to 1950s rock and roll or 1980s thrash metal. 

  • An Italian. 

  • A Greek. 

oiler

noun
  • A Mexican. 

  • An assistant in the engine room of a ship, senior only to a wiper, mainly responsible for keeping machinery lubricated. 

  • One who or that which oils. 

  • A small (typically thumb-sized) metal container of oil, often containing an integral brush. 

  • An oilskin coat. 

  • An oil tanker. 

  • An oil well. 

How often have the words greaser and oiler occurred in a corpus of books? (source: Google Ngram Viewer )