One of the main and common questions is how to tell if canola oil has gone bad. Many signs can indicate whether or not canola oil is bad for consumption. In addition to the taste, it should be stored properly in a cool place and sealed tightly. Stored correctly, canola oil should last a year or two before it becomes rancid. However, if you do not follow these guidelines, you may have to replace your oil sooner than expected.
The first sign that canola oil has gone bad is its smell.