This is not a "german" problem ! The problem is that they try a trip through south america with a modern engine and bad fuel support. All modern engines are designed to these new emission-laws. These low emissions are done by high compression ratios of the engine. If you use bad fuel with a large ammount of water to this engines than you will destroy them. If water gets vaporized it has about 1700 times the volume than as liquid. Everybody can imagine that the use of bad fuel (with too much water inside) caused a big Pressure that destroyed the piston-rings. If you travel on such places it is very comfortable to use a old engine or to get the software of the injection-computer adapted / reprogrammed to this conditions.