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Replace the FilterImmediately replace the filter, and top the fluid level off. It may be defective or the wrong kind. Replace it with an OEM AC/Delco filter to be sure you have the correct filter. AC/Delco filters are very highly rated filters I recommend you use them on your Chevy.

Better answer-Change the oil to synthetic oil! The knock you are hearing is the piston skirts slapping the sleeve due to dry start! Mine did the same thing with conventional oil!

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โˆ™ 2010-04-19 18:54:45
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Q: Just had an oil changed and now the engine knocks at start up on 2001 Silverado?
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