My '03 turbo overheated and when I checked the coolant level, it was obviously mixed with oil--frothy looking, greenish brown sludge in overflow tank. Took it to a mechanic who told me he could fix it in 3-4 days. Two and a half weeks later, I get my car back and the next day check engine light comes on. Back to mechanic and same cycle repeated twice more. In the meantime, he tells me that the radiator needed replacing, the water pump needed replacing and the timing belt. I get the car back and he tells me that the turbo is the problem because it is oil and water cooled and that is where the leaking is happening. I now have a $3000 paperweight from these repairs--it cannot be driven further than 2 miles before overheating. Any help will be appreciated.