I ordered a bunch of these fans for both my OCUK system and my first home built system. So I had 4 brand new fans in total ... I installed them at the same time. One system has been running every day for the last couple of months. the other has only been running for about 3 weeks. I opened up the case on one sytem and found that the fan had blown oil over pretty much everything in sight. I was a bit shocked at this so checked out all other fans. Even on the new system that had only been running for about 3 weeks there was oil from ALL fans around the fan housing ... Each and every Sharkoon fan I bought has leaked oil !!!! These were using the "SILENT 7 Volt" leads so they wer not running flat out. Very P*$£&*d off ... stay away from them !!!