The 2015 thru 2018 generation of the Q3 is one of the most reliable VW/Audi models built in the last 10 years.
I have a 2015 with 89,000 miles, the only problem was the intake manifold, which was replaced for free under an Audi extended warrantee on that part.
Advice:
Change the engine oil and filter every 5000 miles, only use an OEM filter and 0W-40 (or 5W-40) oil that meets the VW502 spec.
Change the automatic transmission filter and fluid every 40,000 miles.
Change the Haldex fluid and clean the filter screen on the pump motor every 40,000 miles.
Replace the PCV/Pressure Regulator unit every 50,000 miles.
The newer generation of Q3 (2019 onward) have more problems....and they don't drive as nice.... they cheaped-out a bit on it.
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