try to search for Opel + reliability, you'll probably won't find a lot of reviews that will favor this brand in terms of build quality and reliability...

"Opel / Vauxhall is one of the big six car makers in Europe. Like Ford, Renault, PSA and Fiat but unlike Volkswagen, it produces the most common cars in all important segments - Corsa, Astra, Vectra, Omega, plus the MPVs Zafira and Sintra and a few niche models. It was never famous for innovation or build quality. "

If you have the money, just get a BMW if you're sticking to German...

Otherwise, stick to Japs.