Well, do a flush to ensure the leak is present, but your are looking at the least disheartening of two possibilities of a blown head gasket.

Depending on the present condition of your rubber cooling hoses, they will eventually begin to rot from the inside out and eventually burst. A hot coolant and oil mix is seemingly not good for hoses.

At least with this kind of head gasket problem you can plan your next moves carefully. You can pick a good indy or collect the resources, tools, reputable machine shop to get the work done yourself.

Alternatively, if the leak of the oil into the coolant is extremely slow, you may just be able to keep driving so long as you keep a close eye on contamination of the oil with coolant and that the rate is not increasing drastically. You could also decide to replace the coolant more often than usual. Just suggestions to a pricey alternative.

At least, that is my opinion/suspicion...

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)