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Milky sludge in expansion tank. I don't really care much for it as it's been doing this since I bought it and I've had the car for 50,000km. No coolant in the oil. Already been flushed and it keeps coming back slowly over time. Just wondering what the possibilities are? Degraded coolant or a small leak between the coolant and oil passages somewhere maybe?
Just asking out of curiosity, not looking for a fix because it doesn't affect anything.