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After engine decoking did not give any results, I decided to overhaul the engine and find out what the reason was, the oil channels in the piston under the oil scraper rings were completely clogged. To summarize, I will definitely switch to another brand of oil, there is even an option, I will show you about it a little later, in other videos, on my channel. On my own behalf, I recommend using a gentle flush in oil to wash the block from the inside and all the oil channels in the engine. I apologize in advance, the video is not complete due to the loss of the necessary video material.