Preheat oven to 375 degrees. Lightly grease the bottom of a 9-inch springform pan with oil, top with a circle of parchment paper.
Pulse crust ingredients in the food processor until about 50% of oats are chopped and mixture is uniform. Press crust into bottom of pan and bake for 20 minutes. Let cool.
Clean out food processor and then add all tart ingredients, processing until very smooth and silky, about five minutes. Pour over cooled crust and smooth top. Refrigerate for at least four hours.