I bought a new VW Tiguan in August 2010. last month the car engine light and EPC light went on an the car just had no revs. VW dealer came to pick up the car. it has been in the workshop now for a month in which period they replaces two pistons (they say due to software updates not done tinmeously), after which it still misfired. two weeks later they got approval to replace the engine. Another two weeks later they now say the oil presuure on the new engine is too low.

I do not know what my concerns/questions to them should be. The car is still in workshop.