What integumentary gland secretes an oil-like substance?
Sebaceous gland is a gland of skin. It is most frequently found in face, forehead and scalp; and associated with hair follicle. The secretion of this gland is called sebum. Sebum is a complex mixture of lipids (oil like substance), that includes triglycerides, waxes, cholesterol and its esters.
Following diagram shows the cross section of human skin, here we can see a sebaceous gland (also known as oil gland).