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White bad smelling smoke after warming up?

Tiny
OLD MAN MARIO
  • MEMBER
  • 2012 MERCEDES BENZ R350
  • 3.5L
  • V6
  • 4WD
  • AUTOMATIC
  • 311,000 MILES
Hello guys,
i have a 2012 R350 BlueTEC that is losing a minimal amount of coolant but the pressure test shows no loss of pressure, however when I drive the car, after a couple of miles when it warms up it gives me a puff of smoke that is whitish is color and has a very bad/unusual smell even for a diesel.
Additional to pressure testing the coolant system I have removed the EGR mixing tube and looked for any coolant leak/traces in the EGR cooler and found none.
Has anybody had this happen and what did they find?
i want to that you guys for having the idea with this site and thank you in advance for ant help/idea that you might give me.
regards, Mario
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Thursday, June 6th, 2024 AT 10:58 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Yep, it sounds like you have a blown head gasket or contamination inside the fuel, has this been going on for more than one tank full of fuel? If so, these guides can help you confirm the problem, you can rent a chemical tester from the local auto parts store for cheap or free if you buy something, anyway, here are the guides:

https://www.2carpros.com/articles/head-gasket-blown-test

and

https://www.2carpros.com/articles/recognizing-the-symptoms-understanding-a-blown-head-gasket-in-your-vehicle

Please upload pictures or videos in your response of any problems so we can see to help confirm the problem.
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Thursday, June 6th, 2024 AT 5:23 PM

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