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· Just play along....
3,392 Posts
Start by reverse flushing your cooling system using a quality flushing agent.

Brown sludge can be corrosion or it can be oil from a leaky head gasket.

After cleaning have your coolant tested for combustion gases to see if it may be a head gasket issue. If the brown comes back it may not be a combusion chamber leak but one between an oil passage and the coolant.

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