headgasket oil in my radiator help

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ive just bought a car and found a thick brown substance in the radiator topup,the cars been cars been flushed,and the contamination got worse,ive just now had the headgasket replaced,and car reflushed,and yet again found a thin layer off a light brown colour  but a dif density not as thick or creamy as wen i first git the car sitting on top of the water in radiator topup point,the car never over heated,and aircon still blows out warm air as normal, any ideas what my proplem could be wouldbe greatful thanks
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