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I wanted to compare modern engines with a 20-year-old one, but the new ones have so many problems that I had to separate them into diesel and petrol ???? I couldn't find a video or audio recording of the biggest diesel problem, so I'll write it down quickly.. The biggest flaw of modern diesels is that the EU makes it mandatory he did the DPF filter, which if it starts to get clogged with soot, the engine injects more diesel to raise the combustion temperature and burn the filter.. but even in a new car, some of this diesel gets into the sump and dilutes the oil.. According to Renault data, 6%, but in the case of diesel used in the short term, much more goes into the oil.. in this case, there are two options: 1. The oil level will be too high, the crankshaft will mix the oil into a foam, the oil with air does not and cannot lubricate oil pressure builds up, the engine is destroyed. 2. The oil diluted with naphtha slowly wears the cylinder wall and piston ring, a lot of small metal chips get into the oil, which, in a lucky case, only grinds the surfaces that should be lubricated and therefore speeds up the process... but it can also clog oil holes, which means the engine will be ruined. If someone gets away with both, don't be sad, you can buy parts worth several hundred euros in exchange, e.g. new turbo, high-pressure pump, you don't even have to go into the elements of the injection system anymore ????