Cayenne Turbos are great SUVs once you have maintenance sorted out. One thing to look out for is the plastic coolant hose that cracks and causes issues, you then have to pay the dealer to install alloy pieces in place of it as it's under the intake manifold of the engine. It would crack and drain out coolant pretty fast. This problem I kept reading about multiple times on earlier model 2004+ Cayennes Turbos.
More in depth explanation:
"Symptoms: immediate and dramatic coolant leak. Can pour coolant in and it drains out just as fast from the rear of the engine.
Solution: Under the intake were the black plastic pipes. In may particular case of the three coolant pipes, the larger one next to the intake manifold runner holes had a 7 inch long crack in it. These lines carry coolant at a pressure, and are apparently a known design problem in earlier Cayenne models. Porsche sells a kit for this (14 different parts, including o-rings) for ~$700. The large aluminum piece with the extra parts are all part of the kit to replace the 3 plastic tubes.
Took removing the intake manifold to get to these parts."
Please do this immediately if the previous owner didn't do it yet.
Check out:
http://www.6speedonline.com/forums/c...-look-out.html
and start looking around and reading:
http://www.6speedonline.com/forums/cayenne-13/