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all 8 of my eco-techs sound that way, it is a known noise and is not a durability concern. The noise is actually coming from the design of the piston skirts. The noise last momentarily after start up then is gone within 2 to 5 minutes. It's hard to hear in the alero's and grand am's because of how well they are insulated. In a j-car it's easy to hear.
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