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What causes sludge/slime and what can you do about it?
Why is there Sludge/Slime in my Radiator? – AMSOIL Blog
The only way to definitively identify what’s causing sludge in your radiator is to perform fluid analysis. The report will tell you if there’s any contaminant in the coolant. Then, have any mechanical defects fixed. Finally, flush the cooling system and refill with a high-quality antifreeze/cool…