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I have a thick dark brown sludge in my antifreez resevoir tank is it oil or really old antifreeze?

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  • Master
  • 417 Answers

Usually antifreeze and oil mixing causes a dark whiteish milkshake consistancy liquid so if its a dark color i'd guess its REALLY old antifreeze with a lot of corrosion from your engine. Get it flushed and changed a.s.a.p. and hope it didnt mess it up to bad.

Posted on Nov 01, 2012

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Posted on Jan 02, 2017

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bcharais
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SOURCE: antifreez is thick brown

you have oil in the cooling system. Check head gasket first then warpage of head then for cracks in head and/or block. This could turn ugly as far as $$ amount. also a job for experienced mechanics.

Posted on Aug 05, 2012

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SOURCE: small antifreeze leak after oil

open the reservoir when cold refill with prestone dont drive with empty reservoir it might overheat and cause aditionnel problem hope its a fix fpr our problem and fixya for my rating thank you pierre

Posted on Aug 03, 2008

  • 7 Answers

SOURCE: got 98 windstar.brown sludge in

Sounds like the antifreeze is WAY pased the point that it needs to be changed. Should be drained, backflushed and have new installed.

Posted on Oct 05, 2008

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SOURCE: in my 2004 gm sierra

you may have a blown head gasket ! One major blown head gasket symptom is a consistently high temperature of the car engine. This is a symptom that can be easily checked from the temperature gauge of the car dashboard. So, chronic engine overheating is both a cause and symptom of a blown head gasket.Check the engine coolant level. If it has dropped suddenly, then there is a possibility that the head gasket has blown up.
Check out the engine oil of your car. If you notice a frothy formation on the dipstick, then there is a possibility that coolant and engine oil have gotten mixed due to a blown head gasket. If you notice emission of sweet smelling white smoke along with water droplets from the exhaust pipe, then there are chances that a head gasket has been blown off.
Let the engine rest and cool down for about twenty minutes. Then open the car hood and locate the coolant overflow tank. If you remove the tank cap and it makes a popping sound, that means the cooling system is still pressurized even after engine has shutdown. This is a clear blown head gasket symptom. hope this helps you. have a good day and good-luck !! I want to add that a clogged PCV can contribute to sludging of the engine. If there is any doubt about the condition of the PCV valve, change it. When a part is this cheap, you should not hesitate.

Posted on Feb 01, 2011

Ironfist109
  • 3018 Answers

SOURCE: what's the brown oil like


  • Sounds to me like the antifreeze needs flushed. The say it's good for 100,000 miles but my experience is 75,000 miles max. When Dexcool gets old it turns a brownish tinge.


  • Now you want to make sure to pull the oil dip stick and make sure it does not look like chocolate mile. If it does then you have a cracked head or head gasket.

  • This can also be a little dirt/rust in the system. If the oil on the dip stick looks normal the flush your coolant.

  • Thanks for using FixYa

Regards, Tony

Posted on Jun 20, 2011

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  • Sounds to me like the antifreeze needs flushed. The say it's good for 100,000 miles but my experience is 75,000 miles max. When Dexcool gets old it turns a brownish tinge.


  • Now you want to make sure to pull the oil dip stick and make sure it does not look like chocolate mile. If it does then you have a cracked head or head gasket.

  • This can also be a little dirt/rust in the system. If the oil on the dip stick looks normal the flush your coolant.

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