Hi Sona, although an oil-based pie crust may not shrink quite as much as a butter crust because oil is 100% fat and doesn't contain water, as butter does, this type of pie crust still contains water, which will contribute to gluten development and will also evaporate, both of which can cause some movement in the crust. If you're blind baking an oil pie crust I would still recommend using weights. 

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