NEVER use oils to make fries.

Only use lard or a mixture of lard and bacon grease.  I actually just make mine in a frying pan, not in a deep fryer or other type of "fryer" OR I bake them in the oven using only those two kinds of REAL fats, never synthetic grain-based or vegetable-based oils.  EWWW.

You won't believe the difference in the taste. 

https://www.thespruceeats.com/how-to-make-homemade-french-fries-2215971