Hello dear Volvo friends, I have to make my contribution now, on the topic cheap fuel or not. I can only recommend to spend the 1-2 cents more for the brand fuel. In another thread was said “The fill only dye and additives to it. Sure, the dye is absolutely amusing. The additives are however true miracle remedies. Since I have contacts to a manufacturer of additives and know that the ONLY come into brand fuel I am also willing to pay that. Here a “evidence” for the effectiveness of these additives:http://tgoetz.turboloaded.de/Images/valves.jpg And in detail WITHOUT additive:http://tgoetz.turboloaded.de/Images/details.jpg This is now just an example of the deposits. I don’t want to look like this my valves… Well, my opinion – as always I would like to give everyone a different and look forward to your feedback! Tom