It just started screaming when I push down on accelerator and stops when let off

What is your question?

Just started making a very loud screeching sound when I push to accelerate. But stops when I let up. I looked in the engine and it seemed hot. Transmission stick was very hot to the touch and I noticed small amount of smoke coming from the whole where that big black ball that is hooked to the hood lines up with. (Btw it that where the engine oil goes?) the only new thing is that I loaned the box truck and he said he put a quart of 10w30 in it because it was low.it was to have 15w40. Would that cause the screaming sound??