What type of oil does Carl's Jr use?

Answer 1

Prepared in vegetable oil (Canola oil, corn oil, soybean oil, hydrogenated soybean oil with TBHQ and citric acid added to preserve freshness). Source: http://nutrition.mcdonalds.com/nutritionexchange/nutrition_ingredients.html

Answer 2

For decades McDonald's cooked its french fries in a mixture of about seven percent cottonseed oil and 93 percent beef tallow.

Answer 3

In May 2011, Carl's Jr announced publicly that they use zero trans fat high oleic canola oil. Hope that helps.