if the quantity is decreasing, you are winning. Even after the leak is stopped, unless a really good system cleaner is used (after fishing out the worst with tissue - it usually collects, mercifully, at the highest point: the header tank), it can continue to emerge there. Once black oil has got into the cooling system, it can be a very lengthy job to get rid of it all. see whether any more oil appears in quantity in the header tank if it does, then the leak is elsewhere, eg head gasket of an engine block problem see whether any oil leaks from the exposed pipe snouts on the oil cooler if it does continue to leak oil, it is perforated (Recommended system cleaner is LiquiMoly Radiator Cleaner #2506 300ml buy 2 and keep the second one as standby.) clean out the cooling system thoroughly, hooking out floating black oil from the header tank with pieces of rolled up kitchen roll oil will cling, leaving coolant behind this will prevent any further oil getting into the cooling system from the oil cooler disconnect these water hoses, and join them together (a short length of 15mm copper pipe can sometimes be used)
This can be diagnosed/checked/isolated fairly easily if there are two coolant (water) pipes connected to it: Most usual cause is the oil-water heat exchanger (engine oil cooler) perforating/corroding internally. Oil is usually injected into water (rather than the other way round), because the oil is under greater pressure.
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