Correct recommend 24V DC Cooling Fan of oil

"24V DC Cooling Fan" on the computer belongs to the high-speed light-load bearing manufacturers have joined the factory just the right amount of grease in the bearing internal fan, why not a liquid lubricant it? Because of its liquidity and volatility are not up to the job requirements of computer fans, so in fact, should be added in the computer fan is grease. Grease has a strong stability, less volatile, etc., so the fan inside the computer manufacturers are adding grease instead of oil. This is why many Diyer hard demolished "24V DC Cooling Fan", joined the so-called oil, sewing machine oil, oil motorcycle noise has improved in a short time, but soon will face the same problem even more serious the reason why! Because not long, lubricants give dried volatilized. More seriously, adding liquid oil, but also dilute the original manufacturers to join the grease, to "24V DC Cooling Fan" bearing a fatal damage, it is counterproductive.