Inspired by video "Can you tell me what it is?" I recorded the noises made by the engine in my Camry right after cold start. The engine is noisy like that for at least for 20000 mi.
This noisy engine is another reason why I am going to participate in cash for clunkers program.
The noise is from:
a] piston slap
b] worn out cam bearings
c] connecting rod bearings
d] the exhaust manifold shield
e] all of the above

"The low mileage is no substitution for rare oil changes"
The camera is cheap, that is why video is not in a good quality.
The car is running on 2 gallon of 2 stroke mix [found in the bushes near the vacant building across the street] added to the tank with 7 gallons of unleaded gas.
Enjoy!!
http://www.youtube.com/watch?v=_JcnuQ1nbxA