30.9k miles on my '00 SVT and it's getting a new long block - under warranty thank goodness. I have a similar rattle that appears under light throttle (rpm and gear independent.)
Technicians removed the oil pan (to verify that I have been taking care of it since I didn't keep my oil purchases) and the valve covers. They could not find anything that would indicate this problem. So, the Service Manager decided to order a new motor.
I just put a DMD on it, as well; however, it was after the noise first occured. However, it was sporatic, mainly when good and hot.
After the DMD it was evident consistently.
I noticed the engine smooth out quite a bit with the DMD on it. I hope it's a '03 Duratec with the DMD and new oil pan, but I won't hold my breath.
Good luck.
Regards,
David
