Low Pression Balbula de Oil Shadow 1993 Aut

Good afternoon, I am new in this typing, but I would like to know what I have to do since I have a problem with my 1993 Aut Shadow since I marked the oil sensor, I just changed the bulb but I do not know if I have to change the oil and filter since when I turn it on it makes a half strange noise

more than anything I do not want to deviate or have to do a readjustment to the engine

I have the first Czech the precion of oil that exists because you could have problems with the oil pump.