Chevrolet Malibu: Diesel or petrol

Hello, I just signed up here in the hope that I can collect information about Chevrolet Malibu here. It’s clear that this is supposed to be my next car. After many German cars, I’m attracted by a cozy Ami sled. Now the question arises: take the petrol or the diesel? I care about the reliability for many years. Driving performance is more or less irrelevant, since I only cruise with the children anyway. I found out that the petrol It has a control chain and the diesel has a timing belt. That speaks for the petrol engine. But I don’t know the petrol engine of Malibu. Is that a reliable companion? It should not consume more than 8-9 liters. I have two specific Malibu in mind: The diesel model has the double mileage (about 70,000) like the petrol engine, is cheaper in the purchase. What speaks for the petrol engine: the low mileage, the double exhaust system (see nice off) and that a petrol engine in a Chevy probably fits better, than the diesel. Both models have the 6 gears automatic transmission, the LTZ equipment and are built in 2012. The annual driving performance is about 15,000 km. So has time in the keys. I thank in advance!