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Rattling noise when engine is shut down

Engine

Model: Targa, Year:2003, Mileage:42,500, Type of use:Street use only
When the engine is turned off, I get a rattling sound for a second or two. It sounds somewhat chain like. I have listened to the engine when it is running -- underneath with a stethoscope -- and nothing sounds too unusual or different from one part of the engine to the other. There are no oil leaks. I use Mobil 1 0w40.There is what I would call lifter noise at start up that lasts for a minute or so -- if I have not driven the car for a few days. This is my second 996.Thank YouTed

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