LOL! In 1975, the recipe probably just said ‘vegetable oil’. I probably used something like Wesson Oil, or Corn Oil - I can’t remember, because ‘oils’ were not used in my household, until I ‘came of age’ and started cooking!
But the last time I made the recipe, and wrote it down for a friend, I used Canola as the best choice.
-JT
This looks delicious. . . .but I would definitely substitute the canola oil.
http://healthwyze.org/index.php/component/content/article/123-the-bomb-shell-truth-about-canola-oil.html