After only 2 months of regular use, a used PC fan is of such terrible quality that it is already making horrible squeaking noises, which WD-40 temporarily eliminates. This usually happens when the fan is many years old and nearing the end of its life. My PC's fans lasted over 10 years before I had to replace them. They were used much more often in everyday life. Good quality PC fans are VERY CHEAP and often sold in kits, there was no reason to skimp on this part but they did.
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