Hello together, I have a big problem with my Aveo 1.2 LS. I bought the vehicle in February 2009 (new), now 50,000 km and a permanent consumption of 12 to 14l /100km. In addition, the valve game has changed. Everything despite permanent 120-130 km/h on always long highway routes (Vieelfahrer ). I had increased the car at the time because I was assured that the exhausting with gas (from the Chevy dealer) like from factory with hardened Valves or a completely hardened head is carried out. Since the valve play is adjusted, it can be assumed that this did not happen Now to the question: Does anyone possibly have “documents” / sources about the use of hardened engine parts for gas operation? These would be enormously important for the detection! Thank you in advance and many greetings J.