Hi! New poster, but have been stalking for about a month I purchased my 2000 1.8l manual about a month ago. 91000 miles, timing belt and water pump have been replaced. It recently sat for a few days and the battery died. Couldn't get it to jump, so I went and bought a new one and it would start, but sound crappy. The coolant light came on so I added more and the oil is funny colored. Is it my head gasket?! There is white smoke coming out the back. I know all of this usually means the head gasket but I don't understand how a dead battery could lead to that... Any help would be great!