Mainframe computer fan noise how trimmed away ah?

Users questions:Today I clean the fan of dust, noise quite a bit, but not ideal, I saw a half-day could not find a place oiling. Please help me.
Experts answer: power supply fan or the CPU, graphics card fan in general had been injecting hole, and can be removed the fan, in the place label peeled off, you will find the filling hole, The best to use sewing machine oil, Moreover, even if the injection of oil, a long time there will be noise, and to long-term maintenance. The best way is a change in the new
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