2006 Mazda6 V6 engine noise on cold start-up?

dkeenan45

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:
2009 Mazda 5 Sport
My Mazda6 Wagon just started to do this on cold start-up. You can here the knocking noise for about 25 seconds then it goes away no check engine light. There are 60,000 miles on the Mazda6 and it is the V6 engine. It seems to run fine., the oil level is fine and only about 1,000 miles since last oil change... Any ideals on what the problem is?
Going to try and attach a mp3 to this...
Thanks for any info!
 

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