Blue Smoke Cold start

[Tdub80]

Hi,  I have a 2016 silverado 5.3 1500 with just under 65k miles on it.  Lately on the first start in the morning I'm getting a brief puff of bluish smoke.  it quickly disappears after a few secs and doesn't seem to happen again until the next morning.  Does this sound like a pcv valve issue, or something worse like valve seals?  Also when the truck had around 57k miles on it I had a collapsed lifter on the passenger side which was fixed under warranty.  I appreciate any help with resolving this issue since the truck is out of warranty now.  TIm

Edited December 31, 2020 by Tdub80

[Snowcamo]

What are leaking intake valve seals for [emoji817] Bob. No big worry. Just keep an eye on the oil level and spark plugs when you change them. The cylinder with oil consumption will be obvious via spark plug.

 

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[Tdub80]

Is this a common issue and something i should just live with?  Could this have anything to do with the collapsed lifter failure?  Ive read about these issues on motors with 200K + miles on them but 65k seems kinda early.  Thanks for your help

[Snowcamo]

Its common in any vehicle these days. Unless its 100% covered by some luck id live with it. Could also just be the GDI oil consumption. Ether way if your not having to pour in a quart of oil every 3k miles id just roll with it.

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[mookdoc6]

Only in mornings on cold days?  It's getting a little more lubrication from the leak down...no big deal!  As long as it disappears in short order and not on subsequent startups during day?  You can drive 100k before it becomes more problematic.  Even when it's become problematic I have driven 4.3L's blowing smoke on startups for untold miles...…...and your not pouring oil into crankcase to keep it between the lines either.

[CamGTP]

Try cold starting it when it's zero degrees outside, there will be a black and blue puff on cold starts as it takes longer to start the engine.

[Tdub80]

ya it just seems to be the first start of the day.  I just never remember seeing it before.  seems like a new problem.  other than that its more of an annoyance than a problem.  I have an older tahoe which doesnt have this problem i just thought it odd for a newer vehicle.  

[Tdub80]

If I can identify which intake valve seal is leaking(by a dirty plug) would this be something I could fix myself as I feel i am somewhat mechanically inclined person? What’s the likely hood that it’s more than one valve seal that is leaking. Or should I leave a job like this to a real car mechanic?