Mayo under oil filler cap.

If the leakdown test failed, you wouldn't know if you had a bad valve, bad rings , or a leak into the coolant passage. A cooling pressure test would pin-point a coolant leak that could be causing the "mayo" to form.

Any one of which would require engine teardown. A definitive answer.
 
No one has asked what kind of oil? :shrug2:

Even after the engine coolant reaches 3 bars on the gauge the oil temp will lag behind in temperature rise. And, the oil will need to get pretty warm to rid itself of the condensate. Simply put, the short trips are killing your oil life. It's okay to continue the short trips if you have to but it would benefit the longevity of your engine to change oil more often. My opinion, of course.
 
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