All A8 owners complain about the oil cooler plastic pipe that breaks and leaks after 130k miles. It doesn't matter if it's 32V or 40V engine. The layout and mounting of both of the coolers are a little different, to me, the 40V (2000+ A is a little harder to... ... do. If we plan to do it ourselves, we should buy the plastic pipe, rubber rings (2), rubber ring for the metal pipe (1), "8" shape ring. If there's is oil/coolant mixed in the system, we may need the whole set of rings in the cooler. We did both 32V & 40V without needing the set of rings in the cooler because even with the coolant leak from the broken pipe, coolant doesn't mix with oil in any of our cars. [...Read more here]