There is no direct answer to which oil has higher viscosity, because the viscosity of oil is related to many factors, such as temperature, oil brand, oil type, etc. However, I can compare these three oils from the following two aspects:

1. Ingredient list

* Peanut oil: In peanut oil, peanuts are the main raw material. Peanut oil has a rich peanut aroma and is suitable for frying, stir-frying and other cooking methods.

* Soybean oil: Soybeans are its main raw material. Soybean oil also has a strong aroma and is suitable for frying, stir-frying and other cooking methods.

* Corn oil: Corn is its main raw material. Corn oil has a lighter aroma than the other two oils and is suitable for low-temperature cooking and cold dressing.

2. Production steps

* The production steps of peanut oil are relatively simple and are generally produced by pressing or leaching. The pressing method uses physical pressure to squeeze out the oil from peanuts, while the leaching method uses organic solvents to dissolve the oil.

* The production process of soybean oil is also relatively simple, and is generally produced by pressing or leaching. The pressing method also uses physical pressure to squeeze out the oil in soybeans, while the leaching method uses organic solvents to dissolve the oil.

* The production process of corn oil is relatively complicated because corn contains high amounts of non-fat components such as starch and protein. It is generally produced by pressing method and solvent leaching method. The pressing method uses physical pressure to squeeze out the oil in corn, while the leaching method uses organic solvents to dissolve the oil.

In general, the viscosity of these three oils is related to their raw materials and production methods. At the same temperature, the viscosity of soybean oil may be slightly higher than that of peanut oil and corn oil, but the specific viscosity needs to consider other factors, such as the type of oil, temperature, etc.