Place the flour and salt in a medium bowl and whisk to combine.
Add the oil, whisking it in until the mixture resembles coarse bread crumbs.
Cut the butter into thin slices and toss them in the flour mixture to coat.
Dribble ice water in, a tablespoon at a time, mixing just until the dough can hold its shape when squeezed (you may need slightly more or less water, depending upon the humidity of your environment).
Gather the dough into a ball, shape it into a disc, and wrap it tighly in plastic wrap.
Refrigerate the dough for at least 1 hour.
Roll the dough out to 1/4-inch thickness, and fold into thirds.
Roll again to about 1/4-inch, then fold into thirds again.
Repeat the rolling and folding process one more time, re-wrap, and refrigerate for another hour.
Preheat the oven to 400 degrees F.
Unwrap the dough and on a lightly floured surface, roll to about 2 inches larger than the diameter of a standard-size 9-inch pie plate.
Slip the dough into the ungreased pie plate, trim away any excess, and fold and crimp the edge.
Line with a sheet of parchment, and fill with ceramic pie weights or dry beans. Partially bake the pie crust for 15 minutes.