At 16,000 km the gearbox started making noise, I changed the oil in the gearbox, the noise did not go away. On the advice of some friends, I added Lubrifilm B2 additive. After a couple of days the noise began to subside, and after about 500 km it stopped. I am happy with the result. I think in about twenty thousand I will try to add Lubrifilm Activ to the engine.