Table 1 shows one common engine and engine cooling related problems of the 2015 Audi S4.
| Problem Category | Number of Problems |
|---|---|
| Engine And Engine Cooling problems |
The r&r valve/oil separator unit failed on my 2015 Audi S4 at approximately 71,000 miles. This unit, when fails, can mix the oil and anti-freeze which can seize the engine. I was able to catch the problem before engine failure. Minneapolis Audi repaired the vehicle this week, 1/10/23. There were no warning indicators except noise. Various media sources have stated that this is a known engine failure concern between 60-90k miles for this engine. Audi does not recognize this as a safety or warranty concern.