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I think that once oil gets in the cooling system, it is difficult to get out in one shot. You will probably want to use an Alkaline cleaner, like Disodium trioxosilicate, pentahydrate. Part number is 001 986 21 71 (500 grams). May take more than one treatment?
Once you've used the cleaner, then you might want to use a Citric Acid flush at 100 grams per liter. Part number is 000 989 10 25 (500 grams).
I think it is also recommended that the coolant over flow tank be replaced. I'm not sure that you can really get it clean, but maybe so.
If the oil is left in the system too long, it will degrade all of the rubber hoses and they will have to be replaced.
Good luck!
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