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1994 968 Valve lifter question

Engine

Vehicle Information: Model(924/944/968): 968; Year: 1994; Body Type: Coupe; Total Mileage: 65,000;

I recently let the car sit idle for 3 weeks. Upon starting, I noticed a pronounced "clacking" from the motor. The dealer diagnosed this noise as one or more collapsed lifters due to the car sitting idle.Should lifters leak down in only 3 weeks?If they do leak down, shouldn't they pump back up very quickly (say 10-15 seconds)? According to folks at the dealer, they had to run my car for 45 minutes or so before the lifters quieted down.

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