In view of the CO2 debate, Porsche no longer excludes the addition of a more economical diesel engine to the series. “It was never a categorical no,” Wiedeking said. Basically, a diesel engine could already be installed in the Cayenne off-road vehicle today, but the extra weight of 150 kilograms costing driving dynamics and keeping Porsche from it so far. Source — According to the statement, it will probably not become more self-developed, maybe the Boxer Diesel from Subaru would be something 🙂 But I think 150 kg of argumentation is ridiculous.