This afternoon I put in my chip (TAP) & drop in filter and made a discovery. It appears that oil has leaked into the rubber "S" tube, thats connected to the intercooler. As i understand it, only air should be passing thru there? Has this happened in anyone else's A4? Is this something to be concerned about? Thank you guys in advance for your insight........JA 1.8TQM

Believe it or not, your intercooler does collect a thin layer of oil. It is perfectly normal. Most die hard turbo racers will pull them out once awhile and clean them with Kerosen (sp?).
Probably more info than you need to know.
In short, if there is a small amount of oil residual... it's okay.

Cris