First of all a hello to all Opel drivers who are on the road with one of the best batteries available. At least according to the judgement of the Stiftung Warentest from November 2007 (see e.g. test report on car batteries). I strongly assume that Opel produces “his” batteries just as little as all others. Therefore the question to you: Who is the manufacturer? So that drivers of other brands can start with the same batteries. Especially at these low temperatures. for your helpful hints! Greetings S202.188