When I first got out of the car I went to the rear first to see if the tail pipe was sooted from the smoke I was seeing. I looked under the car from the rear toward the front and seen the fluid flowing up front... thats when i went to the front and poped the hood. The fluid was coming from the filler area and flowing down the engine. Most got burned by the exhaust, but there was a fair amount still on top of the transmission. Any ideas on what would possibly cause a back flow like that?