Mine does the same thing. Gotta love the black smoke of a diesel. My daughter is now driving my 06 Duramax so I put it back on factory settings. No need for a 16 year old girl to have 600HP. As for the orignal post I would change the oil and go back with 1/2 oil and 1/2 Marvel Mystery Oil. Run it for 1000 miles or so then change again and add 1 Qt of Marvel to your oil.
Wouldn't marvel or sea foam just clean the journals, thin the oil, and probably make it smoke more if the valve seals are shot? You might try some of that restore crap. It might help. Or just let it smoke and make sure you keep enough oil in it. If it still has good compression you should be able to change the valve seals without pulling the heads if you are careful not to drop one down the hole...
Jeff I forgot about GM changing to a fixed orifice PCV valve to slow down oil consumption, so there isn't anything to get stuck open and let oil through.
PCV valve as mentioned above, also what brand and type of oil are you using, are you using any oil additives? I ask because all my family's rig's are late model 96-99 Chevy/GMC's and we use the Lucas Heavy Duty OIl Stabilizer in all of them, 1 quart per Oil Change regular use but with your issue I would try 2 quarts plus remainder of your Regular Oil.
I have slight white puffs when cold in the mornings during winter, but none of that madness once it warms up, I have a 99 Suburban with 210k on it runs like a top, Pop's 99 has 280k runs like a top, 95 farm truck with 320k...shes a bit rough but we beat on her....these are all original motors and transmissions, only Pop's has had a rebuild on his trans.
I have slight white puffs when cold in the mornings during winter, but none of that madness once it warms up, I have a 99 Suburban with 210k on it runs like a top, Pop's 99 has 280k runs like a top, 95 farm truck with 320k...shes a bit rough but we beat on her....these are all original motors and transmissions, only Pop's has had a rebuild on his trans.
I would go for the lucas over the marvel personally in the Engine, as it is designed to ONLY go in your engine, not be combusted as well, just my 2cents.
With 174K on the clock, I wouldn't worry about it. It really won't hurt anything.
If you can't stand the smoke, the seals can be changed without pulling the heads, either by using compressed air to hold the valves closed, or by feeding a clean rope into the cylinder through the spark plug hole and then carefully rotating the engine to bring the piston up far enough to push the rope against the valves.
I have been where you are, I have the tools and experience to replace the seals, I left them alone.
If you can't stand the smoke, the seals can be changed without pulling the heads, either by using compressed air to hold the valves closed, or by feeding a clean rope into the cylinder through the spark plug hole and then carefully rotating the engine to bring the piston up far enough to push the rope against the valves.
I have been where you are, I have the tools and experience to replace the seals, I left them alone.
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