Question about GMC Yukon Denali

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What will cause my 1999 Yukon Denali to shutoff on me while im driving?

Its milky like stuff on my oil dip stick

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YOU MAY HAVE A BLOWEN HEADGASKET OR INTAKE......ANTIFREEZE IS MIXING WITH YOUR OIL.....THATS WHAT GIVES YOU THAT MILKY COLOR ON YOUR DIP STICK....BUT IF YOU JUST CAUGHT IT ,,,IT CAN BE FIXED WITH OUT SPENDING ALOT OF MONEY

Posted on Feb 05, 2013

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Posted on Jan 02, 2017

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MrScary66613
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SOURCE: Milky oil dip stick

They are Correct on this Diagnosis.

Posted on Jan 22, 2009

smartr10U
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SOURCE: I have a 1999 GMC Yukon Denali, 350 V8. I want to

check in the area above the rim of the oil filter...they're typically located very close to the filter.
k

Posted on Jun 26, 2009

Mike258
  • 1498 Answers

SOURCE: Milky white fluid on oil dip stick,, engine vibrates when idleing

Hi Joseph,

That white fluid is emulsified oil and water. Coolant is getting mixed with the oil and the engine whips it into a sort of milkshake.

The head gasket probably failed along on or more of the cylinders. This would explain both the oil/water and the rough running. Have you noticed a loss of power?

I'd run a compression test to confirm it. But it sounds like you need to replace the head gasket.

Sorry about the bad news,

Mike

Posted on Sep 25, 2009

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SOURCE: 2001 Yukon Denali: The security light came on my 1999 Yukon Denali ye...

The security system (Passlock) is having problems, it's typical on those trucks. You can find a great write-up here: http://newrockies.ca , it was the only thing that saved my Park Avenue.

Posted on Jul 16, 2010

  • 3911 Answers

SOURCE: oil looks milky on dip stick

your coolant is getting into your oil, this is a bad thing and should be looked at ASAP

Posted on Dec 20, 2010

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Sounds like your head gasket is broken. I would check your dip stick where you check your oil level. Look if the oil is milky (oil and antifreeze mixed). if it's just oil it would be just brown.

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