Well, since Kikemec took me out of doubt, which I appreciate it and since we touched the theme of the hydraulic takis (in Mexico Hydraulic divers) in my Nissan Quest 96 the Takis sound especially in the mornings and stop sounding a few minutes after having caught the engine. My mechanic (and always the confian) says that I have no engine problems, that the engine is fine and that this noise is an annoying noise for the ear, it says that what happens is that they are downloaded when the engine is off and that when I start it as they are downloaded because they sound until they are going to load, I understand this and I agree but my questions are if this in the long term can affect the engine. Consequently, it is better to change them and if it is difficult to change them, that is, if then you have to calibrate aterns or something like that, or if to change them you have to consider other aspects, or I placed it to the mechanic and I do not get into trouble. As always, thank you very much for your time.