Severe oil sludging noticed while replacing leeking valve cover gasket

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Hello all!

   I'm new to this forum but hoping someone has encountered the same issue I am having. While replacing leaking valve cover gaskets on my 2000 626 2.5l with 117,000 miles. I was horrified when I took off the first cover and found burnt/sludge oil approx. 1/8" thick in and on all surfaces of the valve assembly. I now have some major concerns about the engine getting lubricated properly. About a month ago the coolant reservoir cracked and the engine slightly overheated for a very short time. I am fairly certain this is what caused the sludging but never in all of my years have I seen it so bad. Has anyone else encountered this and any recommendations on how to clean/remove it? I thank you in advance for any and all suggestions!  

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It's not a common problem on these engines. But 1/8" isn't so bad. I would just change the oil more frequently for a bit, which is the safest solution. The detergents in the oil will clean it off.

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