What to do if your car is on fire?

My friend’s engine lit on fire… what’s wrong and how can we fix it?

OK, so his car engine smokes every time we drive it so we checked the oil. There was none (not very good to be driving around with haha) So we proceeded to an auto store and bought 2 bottles of 30 weight oil and 2 of 40w on accident (is that a problem?)

After we drove home, we noticed it was still smoking and oil was leaking from somewhere, and there was a tube not connected to anything on top of the crank case by the air filter (not oil related, right?)

He then drove home, and his engine lit on fire! I’m guessing it was probably the oil leak and the high temps that did it.

Here are my thoughts: Main engine seal is no good, intake manifold is leaking, or that tube has something to do with it. He’s gonna try to take it to grease monkey in the near future and hopefully they’ll be able to fix it.

Can someone PLEASE tell me what might be the cause of this smoking and leaking oil?! Thank you so much for your help!