In a sauce pan on medium heat, add water, sugar, vegetable oil, and salt.
Continue stirring until the sugar melts and the mix is well incorporated.
Once the water comes to a boil, turn off the heat.
Add the flour and mix until a pastry dough forms.
Let it sit aside to cool down.
Mix the sugar and cinnamon and set aside as a rolling station.
Place your cooled pastry into pastry bags. If you have tips, choose wide ones if not, don't stress I usually make them with no designs and do not use pastry tips.
In a pan heat oil for deep-frying, and add the churros without over crowding the pan.
Fry in batches until golden and roll in sugar/cinnamon as soon as you take them out of the oil so the sugar sticks.
Serve hot and enjoy.