I started hearing a loud buzzing noise whenever the engine was running, and I was afraid it was transmission related. But when I checked further I found it was coming out of the water pump. The I recalled my dad saying the water pump needs oil once in a while. Sure enough theres a little hole on top of the pump casting, and when I put in a few drops of motor oil, the buzzing went away. Weird, but it doesn't seem like a normal maintenence item. I thought water pumps are self lubricating.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma