How to fix coolant getting into the oil.

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For a proper coolant flush you need to use a product that bonds residual oil and let it flush, otherwise it will stick to pipes and passages. Something like "Liqui Moly 2051 Radiator Cleaner". Could be domestic as well, for half the price.

You would probably need to do it for a few times, once in a while, until every drop of oil leaves the cooling part of the engine, which can take a long time.

Don't drive on a pure water for a long time - it will coat all the hot surfaces with lime stone and will worsen heat transfer by an order of magnitude. Also don't drive with the same coolant for too long: the same thing happens, when the coolant has no more additives to fight the lime stone. Coolant is definitely not a life time fluid.

What does oil in the coolant look like? I flushed the cooling system, and the water is a little dirty, by it does not look like there is oil in it.

[vtl]

What does oil in the coolant look like? I flushed the cooling system, and the water is a little dirty, by it does not look like there is oil in it.

Leave it overnight in a jar, the mix starts separating, oil will float up.