4.3 vortec lifter noise

Have 96 Safari van with a 4.3. Right after getting an oilchange the lifters started clacking quite loudly for the first 15 minutes or so until engine warms up. Have had a couple of mechanics look at it without finding anything. One suggested that the addition of Duralube at oilchange may have loosened something in the lifters. Anyone have any ideas???

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carguy
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