my 2001 did the same thing until i started using amsoil full synthetic and then it quit. might work for you. i know if i didnt work where i did its like a 70 dollar oil change but i got it for twenty so i was thrilled!
well i think I get a noise similar. It started happening after I got my K&N oil filter. I think it might have something to do with the anti-drainback valve. Dunno. I don't have anyone to listen to it that actually could figure out the problem.