Want to have a saddle you use 4 times a week that still shows few signs of wear? Here is how to oil your saddle.
Go to the nearest supermarket and get the cheapest olive oil you can find. You'll want the cheap kind. It'll work just as well as any other.
To start out, get only one or two bottles, quart-sized. A saddle takes around a quart and a half initially.
Make sure you're saddle is COMPLETELY CLEAN, so get a clean, soft paintbrush. A three-inch-wide brush that's not thick will be great, so you can cover the flaps and seat quickly, but still get into the creases and folds.
Cover every inch, including the billets, gullet, and up under the stirrup bar. Reapply over and over until the absorption starts slowing down.
Wipe off excess. This should be good to start, but make sure to oil your saddle routinely to keep it soft. You could use more professional, specialty oil for this.