Hello,
The yellow milky residue indicates there is condensation in the oil. It could be due to a head gasket leak.
Best course of action would be to perform a head gasket leak test. There are few different ways to check. One of them is using a head gasket leak test kit. This test uses a chemical that detects any combustion gases in the coolant. It can typically be purchased at your local auto parts store.
Here is a helpful video:
https://youtu.be/5zpNjYmmiYY
Since you are losing coolant, it will be a good idea to do a cooling system pressure test. This can help you determine any leak.
https://www.2carpros.com/articles/radiator-pressure-test
I have attached diagrams for your reference.
Please let me know if you have any questions.
Thank you.
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Thursday, November 11th, 2021 AT 8:16 AM