Hello, my car is a 97 Audi A4 Quattro (V6 2.8 12v). My car this past week was taking a long time to start, and now it will not start at all. The engine is turning over but it will only briefly sputter and then cut right back off. Sometimes it will backfire a little. This problem began when the temperature here dropped into the teens, but now even when it has warmed up, it still won't start. Another thing I noticed is that oil is constantly dripping from behind the oil cooler.

Here is what I have done/know
- the fuel pump is working
- replaced the battery today
- somewhat recently replaced the coolant temp sensor (2 yrs ago)
- no coolant in oil

Thanks in advance for any advice...