looking at your picture I see quite a bit of water droplets on the underside of the oil filler cap. Not good.
Also due to the fact that your slowly loosing coolant that makes the water droplets more suspect. So finding the reason for the coolant loose is rather important.
Things you can do:
Coolant system pressure test.
Test coolant system for presence of hydrocarbons, I think you can still get test kits for this at auto parts stores.
Send an oil sample out and have it tested for the presence of antifreeze.
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