6.0L cold start noise

[Chris Kelley]

Hi I have a 2014 GMC Sierra 2500HD CC. For about about 4,000 miles now (currently have 18,000) I've been having a random noise at cold start as long as it sits for longer than 45mins. It's a very quick loud chatter lasts about 10-20 seconds then is super quiet. When leaving work in the morning and walking up to it about 200 feet away you can hear clear as day . Running ams oil & filter with no change either.

[MORSNO]

Like the normal GM lifter/valve clicking? Could be louder due to cooler wheather in the mornings?

[Chris Kelley]

No sounds like the lifters are dry until the oil pressure gets there.