Source : Webster's Revised Unabridged Dictionary (1913)

Oiler \Oil"er\, n.
   1. One who deals in oils.

   2. One who, or that which, oils.

Source : WordNet®

oiler
     n 1: a worker who oils engines or machinery
     2: a well that yields or has yielded oil [syn: {oil well}]
     3: a cargo ship designed to carry crude oil in bulk [syn: {oil
        tanker}, {tanker}, {tank ship}]