More precisely The fan in the PC and WD 40 ..... For some time now, the fan annoyed me on one PC ... it made quite strange sounds of thunder as if it was unbalanced and as if it was just running halfway ..... so I from the Notebook ... he took out .. disassembled I pulled out the classic propeller that is on the axle .. the drive is outside the fan ... so I pushed the WD 40 directly into the hole where the axle fits ... To my delight, the O5 fan runs smoothly and I hear. ..will even switches to higher speeds when the PC is more busy and overheats ... However, the question is how this silicone oil behaves and the electronics will not be a problem or .... should I look for a new fan right away? ... I just started SpeedFan ..and the pc has me waiting OK ... the temperature ... ☢ ☠ ☣ ☠ ☣ ☠ ☣ ☠ ☢