Been on vacation, so I'm a little late to the conversation...
I had an Opel and it was a nightmare.
The thing would run about 50km and then the engine would die. Can't start again. Waiting over 4 hours and it would start again... for another 50km.
Went back to the garage about 10 times, they couldn't find the problem... each time I would get stuck right after passing the 50km mark.... last time, it stalled in a tunnel and I said "enough".
Gave the car back.
I live in a very hot place, and someone told me that Opels are now able to handle the very high temps and humidity we get around here. Truth or not, there used to be a lot of Opels here, now, they are pretty much gone.