Replacing a PSU fan

I have a Corsair 400W power supply in my rig. It has served me faithfully for years, but I’ve noticed the fan gets quite loud when it kicks in. Is there any way to fix this, or is it time for an upgrade?

Sure, you could try pulling the power supply out of the case, cracking it open, and swapping out the fan. You'd just need to pull the dimensions and grab a replacement of the exact same size. If there isn't a dedicated connector on the PSU board—meaning if it’s soldered directly onto the circuit—you might have to get a bit hands-on and solder the wires together. Red to red, black to black, I guess.

This is regarding a 120mm fan. I'll have to take it apart one day soon. I just hope I don't mess up the wiring while I'm at it..

Pull the fan. There's a sticker or similar marking on the center of the motor; peel it off. Apply one or two drops of motor oil—you can even go up to the top. It doesn't matter if it’s old or new, just grab some Valvoline or something. Then, reseal the hole with a new sticker or a piece of high-quality tape, like Scotch tape, ensuring the area around the hole is clean.
It will last 100 years. You won't find better lubricant than motor oil.
In 34 years, I have never once needed to buy a new fan, unless I required a larger model.

Best regards,
B. W.