Filled this additive. After driving it for 500-600 km. Sounds like a startup sound. the motor became quieter. But the temperature outside by this time has changed to +. Therefore, it is extremely difficult to say whether the additive worked for sure or whether this is the reason for the temperature difference upon starting the engine. I can definitely say that at -15 and at -2 there is a difference in the noise level of the engine.
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