I have the stock SVT air intake with a H/F K&N filter. What would cause oil to come up through the bottom of the air box where the little piece of spongy thing (for lack of better word). I forget what the tube is called, but it runs to the engine. I had the same problem in Germany, but it was on my '87 Mercedes 290E and never got it looked at. It is not a lot of oil, but it is enough that is was on my air filter when I cleaned it last. Also I'm missing the little spongy thing. Anything I can use for a replacement?