2015 Audi B8.5 S5 Sportback 3.0TFSI
How long routes do you drive most often? If you've only been driving short distances recently, the oil may not have warmed up to operating temperature, especially in winter. Emulsifiers bind water and cause the deposition of discolored goo. This is the general and simplest cause. How often do you change the engine oil and what is the specification?