2018 6.7 liter sudden blue exhaust smoker - Dodge Cummins Diesel Forum
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post #1 of 30 (permalink) Old 11-19-2019, 07:59 PM Thread Starter
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2018 6.7 liter sudden blue exhaust smoker

All, I deleted my 2018 Cummins at 8000 miles back in April using the raceme ultra tuner along with 4” diamond eye exhaust and egr delete with banks ram tube.
the truck now has 16000 miles, this past weekend while using truck in very cold conditions so I turned on the exhaust brake to assist with heating the engine, soon there after I noticed the truck blowing blue smoke, I changed the oil (shell rotella 15-40) and Fuel filters, about 1500 miles ago.
Any thoughts on what could be causing this ?

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post #2 of 30 (permalink) Old 11-19-2019, 08:59 PM
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The cold.


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post #3 of 30 (permalink) Old 11-19-2019, 09:35 PM Thread Starter
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Was thinking that, could bad fuel cause this also
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post #4 of 30 (permalink) Old 11-19-2019, 09:36 PM Thread Starter
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Oil pressure and temp is normal
Water temp is normal
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post #5 of 30 (permalink) Old 11-19-2019, 09:42 PM
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If this is the first time its been at high idle in the cold I would just monitor it the next few times you start it up in the cold and see what happens when the high idle starts.

If it continues you may have a tuning issue.. ?


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post #6 of 30 (permalink) Old 11-19-2019, 09:42 PM Thread Starter
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Also forgot to mention, driving last two days with temps in 40s and 50s and still smoking
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post #7 of 30 (permalink) Old 11-20-2019, 12:03 AM
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Also forgot to mention, driving last two days with temps in 40s and 50s and still smoking


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post #8 of 30 (permalink) Old 11-20-2019, 12:25 PM
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Check to turbo intake for oil from the ccv filter. You might also have a bad seal on the turbo which could also cause a leak. Check the turbo for oil to make sure.

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post #9 of 30 (permalink) Old 11-20-2019, 01:48 PM
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2018 6.7 liter sudden blue exhaust smoker

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Originally Posted by cwendel View Post
Check to turbo intake for oil from the ccv filter. You might also have a bad seal on the turbo which could also cause a leak. Check the turbo for oil to make sure.

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What is wrong with some oil from the crank case? Of course there will be some at the turbo.


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post #10 of 30 (permalink) Old 11-20-2019, 06:18 PM Thread Starter
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Ok, I’ll check the inlet of the turbo, I shouldn’t have crankcase oil at 16k.
I was also thinking about PCV valve and or bad tank of fuel.
Your thoughts?
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post #11 of 30 (permalink) Old 11-20-2019, 07:36 PM
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2018 6.7 liter sudden blue exhaust smoker

You have no PCV valve. And there will be oil from the crank case at the turbo inlet. It’s a combination of the tuning and the temperatures. Your truck is fine.


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post #12 of 30 (permalink) Old 11-21-2019, 11:02 AM
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Oil at the turbo inlet is from the ccv filter. If you have oil there, there will also be oil in the intercooler. Not a good condition. And 40-50F is not all that cold if it still smokes once the engine warms up. It seams the OP is smoking when warm too.
Blue smoke means oil is burning that should not be burned. Like when you have bad valve guide seals.
Now, as long as the smoke is only at startup and goes away once warm it is okay. But if it continues when warmed up then you need to look at issues.
And yes, the ccv filter can be full of oil and need changing by 16000 miles. Mine was full by 24000 and started to oil the intercooler.

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