Hello, actually I had already shot myself on a diesel for cost reasons, but am now considering whether also an LPG car would be what for me. I just stupidly have absolutely no idea of the matter and would like to know what I have to pay attention to especially with a used LPG vehicle. Should the system have already been installed on the factory side or does it also a retrofit system? What about the size and location of the tank? Are there manufacturers whose systems are better avoided should? If retrofitted, should the engine bring certain prerequisites in advance, so that it also lasts for a longer period of time, or is this usually already considered during installation and retrofitted if necessary? Your very, questions about questions. Would be great if you could advise me a bit. Thank you!