Bortec antifriction additives are best used in cars with low mileage, say up to 100-120,000 km, or after using Lubrifilm remetalizant. With a slippery ceramic surface, metal is less effective.
If you are accustomed to using only Lubrifilm (Metalyz) remetalizant regularly with each oil change, then during repeated treatments it is enough to use half of the initial dose, since there is no need to restore anything, the metal is used only to maintain the current state.
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