Prepare Tortillas: Combine the rinsed lentils and water in a medium bowl or other container; loosely cover. Let stand, at room temperature, for at least 6 hours or up to 12 hours. (Alternatively, quick soak the lentils in boiling water for 30 minutes)
Do not drain lentils.
Add the entire contents of bowl (soaked lentils and remaining water), oil and salt to a blender or food processor, Blend on HIGH speed until completely smooth (no tiny bumps) stopping once or twice to scrape down the sides of container. The batter should look somewhat fluffy. Scrape into a bowl or measuring cup.
Heat a nonstick skillet (well-seasoned cast iron skillet is ideal), or a nonstick griddle, to medium heat (no hotter).
Once warm, add 1/4 cup of batter to the center of the pan (the recipe yields 2 cups of batter). Using a metal spoon, spread the batter into a 6-inch circle.
Cook for 1 to 1-1/2 minutes until surface of tortilla appears dry. Slide a spatula underneath and flip. Cook about 1 minute longer to brown other side. Transfer to cooling rack and cool completely.
Repeat with the remaining batter.
Make the Chips: Preheat oven to 250F. Line 2 large baking sheets with parchment paper.
On a cutting board, evenly stack the tortillas. Cut the stack in half, and then in quarters. Cut the quarters in half, so that each tortilla yields 8 even wedges.
Arrange wedges in a single layer on the prepared baking sheets.
Bake in the preheated oven for 45 to 50 minutes or until chips appear dry and somewhat crisp. Turn off the oven; let chips remain in oven for 15 minutes longer. Remove from oven and let cool completely on baking sheets.