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oil in water on 2000 Cadillac Catera

i have oil in the water but not in the block. just had oil changed and they put 7qt in it.

Asked by for the 2000 Cadillac Catera
It's a very common problem with this model. You have a bad oil/coolant heat exchanger which is located on top of the engine. Fairly expensive to replace.
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It's a very common problem with this model. You have a bad oil/coolant heat exchanger which is located on top of the engine. Fairly expensive to replace.
Than one of the tanks on the side of the radiator may be bad
Mine had water, as in white milky substance, on my oil refill cap - none showing on dipstick. I was told that sometimes due to humidity, etc. it will acquire moisture in the oil. Was recommended to clean refill cap and recheck in a few days. For mine it was as simple as that. Hopefully you don't have oil/water mix on dipstick. Good luck!