I just bought a 90 Civic DX. I was driving back home from where I bought it (3 hrs away), I stopped to pump gas. I notice smoke coming from the hood and under the car. I popped the hood up and I see smoke coming from the back of the motor. When I drove it today from work I didn't notice the smoke anymore, but I can still smell it. I'm confuse on where the leak could be coming from. Where can it be leaking from the back of the motor? This is my new daily driver and work car. Help me guys!!!

 

check oil filter and oil pressure sensor...

could be a valve cover, head gasket, many many things.