I got a chuckle out of "If this is a vegetable oil as the name implies,...". A corn head is a gear box on a piece of farm machinery. I can see how you might have been misled.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.