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I have been working with cars for 40 years, but I have never seen anything like this. It was hard to get dirty with used oil while adjusting the valves - says Szymon Janusz, our Reader from Jasło in the Podkarpacie region, in an interview with the warsztat.pl portal. He is the user of a Mercedes Atego 812 from 2000, Euro 2, with a four-cylinder 120 HP engine. Our Reader last changed the oil at 773,900 km. The current odometer reading is 1,108,000 km, so it is already 334,000 km without a complete oil change. However, the oil filters are replaced regularly. There are also quite a few top-ups, about 1 litre per 2,000 km. - There is nothing wrong with the engine! - he emphasises. Are you sure? We ask the expert.