The engine of your classic car must be filled with mineral oil. Especially when the machine has already had some adventure. Now it is possible that you are on the road and the van with the spare oil has already smoked, you arrive at a modern gas station and then they only sell synthetic motor oil or a semi-synthetic one. You do not need to ask the cashier whether you can mix it with the mineral oil in your engine. And then? Surprise, synthetic oil is made from large components of mineral oil and can therefore be mixed. We would get it out as quickly as possible, that is, change, because synthetic oil and mineral oil work against each other ... Synthetic oil cleanses strongly and then it can happen that your classic will start to sip a lot of oil in a short time ... Incidentally , we let you know before that, modern mineral oil must lack the zinc required for your classic car and inadvertently causes extreme wear during prolonged or sporty (...) use ...