I have a 2005 1.8T wagon to beat on in the winters. Love it. Super high maintenance car and quite complex compared to others at the time. Change the oil frequently and there will be no sludge issues (at least on mine anyways). 2006 is very similar and has the 2.0T that is a better engine from what I've heard. Get the special expensive Ross-Tech cable to diagnose and clear codes that you WILL be having. See if the belts/WP/Thermostat have been done. Every ~100k miles you'll have to do this:
