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  #1  
Old 03-06-2013, 11:35 PM
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HEEELLPP 91 mercedes 300E

Just bought a car. What does it mean when there is gray sludge in the water reservoir of a 91 mercedes 300E? Oil is NOT milky.

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  #2  
Old 03-07-2013, 02:22 AM
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1991 300e

sound like your head gasket is blown and hopefully the heads are not cracked sorry.
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  #3  
Old 03-07-2013, 07:36 AM
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Yup, gray sludge would be oil residues. Could be from a previous issue that was then fixed, or could be from current issues. How does the engine run? Losing any oil or coolant? Exhaust smell/look normal?
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Old 03-07-2013, 11:16 AM
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I once had brown gritty stuff in my coolant. It turned out to be Redline
Water Wetter not a blown HG.
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Old 03-07-2013, 01:53 PM
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If the head gasket is original, it is most likely blown. That engine is notorious for a head gasket which had a weak spot in the design. Replacement gasket is said to be "new and improved", so it won't happen again.
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Old 03-07-2013, 06:25 PM
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It could have been fixed though and then they just never cleaned the tank i noticed the same in mine after I did the gasket and it took a lot to clean it all the way out. but it was worth it it really helped. Drain and clean the coolant.

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