Documenting how i replaced the intake manifold gasket on my 2003 Buick Century. I am not a professional. Please use this as reference only.
Brown sludge inside radiator – replacing intake manifold gasket GM LG8 3.1 buick Century Grand Prix
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no, brown sludge is just an indicator of oil mixing with coolant. It could have been the head gasket, but this car is notorious for the intake manifold gasket going bad. Which is why i did this, and i was correct.
so if you have slugde like that. then you should do this>???