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Depending on how thick the sludge is, cleaning may not work. I had a 99 996 with a known intermix that I bought and replaced the engine. I learned the coolant lines could not be cleaned and I replaced all of them. LOTS of hoses and about $1500 later. I had to replace the hard center pipes as they are thin aluminum and became perforated with pinholes from the cleaning dip. The rads survived the dip cleaning. If it still looks like coolant then you might be ok. If it’s lined with a brown sludge, it’s an issue.
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