I have always been having this problem, but am just now addressing it since I am getting all of my minor leaks fixed.
Almost every time I get aggressive with the car, romping on the gas, cornering hard and such, I get a light oil spatter around the top of my dipstick tube. The dip stick isn't coming out of the tube, but there is a light oil spray right around there on the heater hose, and then back onto the manifold and spark plug wires on the passenger side. I also noticed a new leak today down at the base of the dip stick tube. It seems like it is leaking from where the tube goes into the front timing cover. It was leaking from there with the engine off, I was watching it drip. It only dripped about 10 drops or so, then it stopped, took it 2 minutes or so after I shut it down to stop dripping.
So what is going on? The spray out of the top of the tube, is something weird causing this? The engine is running well, the pcv is new, and most everything else seems to be in good working order.
One thing I do notice too is that my oil gets dirty quickly. The motor was rebuilt about 30,000 miles ago, and every time after an oil change, at about 1000-1500 miles, it is black again. I have tried flushing it, like change the oil, run it for 500 miles, and change it again, but it still gets dirty quickly.
So, any ideas for solutions to my problems (regarding the mustang, I am a whole different story...)?