After all this talk about filters. . . I have an 87 5000cs quattro. Is my car intercooled? (I think so!) Do I have a watercooled or an oilcooled turbo? (Just don't know!) And, How many filters do I have? (One?) Just wondering, Andrew Shea (Of course, I would just go out and look at the car to find out if it was not in the shop!)