I have the 4 cylinder in my 99 and have a leak in the rear of the motor. It drips down onto my exhaust and makes a smelly mess. It is a very slow leak but constant. Any ideas of what it could be?

 

There's just a couple things back there for you to check...

Oil filter gasket would leak directly down onto the exhaust.

Just above the oil filter is the oil pressure switch. That's a sorta-common place for a slow oil leak (through the middle of the sensor).

If there's evidence of oil ABOVE the pressure switch, then check out the valve-cover gasket. Or the head gasket.

 

I've put multiple filters on throughout the period of the leak so I'm going to rule that out.

 

Clean it up real good & look for the highest elevation that gets oily.