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1999 996 engine rattling sound

Engine

Vehicle Information: Year: 1999; Body Type: Convertible; Total Mileage: 27800;

When I start my engine their is a rattling sound for the first 3 seconds, then another sound like valve tapping for the next 10 seconds... I use Mobil 1 0-40 synthetic, 9.25 quarts. with filter change. Just had my 30k tune up and changed plugs. Is this normal, or should I add something like Duralube.

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