Oil-based stains should be pretreated using a solvent-based stain removal product, like Shout or Spray 'n Wash. If you don't have a solvent-based pretreater, apply heavy-duty liquid detergent to the stain and work it in by gently rubbing.
Stain sticks are particularly convenient for collars and cuffs.
After pretreatment, wash the garment as usual in the hottest water appropriate for the fabric using the recommended amount of detergent for a regular load. Inspect the garment before drying and repeat treatment if necessary.

