Best Engine Oil for Audi A3 Petrol - Recommendations Needed

Yep been there done that. Can confirm everything said above is spot on.

Ngl I have been super satisfied with Quaker State Euro Full Synthetic 5W-40 lately. It meets the VW 502 00 specs and you can usually find it for a total steal at Walmart or online compared to the big name brands. If you are looking at long-term reliability, it is all about that high-temp high-shear (HTHS) stability... this stuff holds its viscosity really well when the turbo gets hot. Honestly dont overthink the 5W-30 vs 5W-40 debate too much as long as that specific VW approval is on the label. I have been running this setup for a while and seriously no complaints. Engine stays quiet and it saves a decent chunk of change every service which is always a win. Just make sure you grab a solid filter like the MANN-FILTER HU 6013 z to go with it. Keeping it spec-compliant while hunting for deals is the best way to hit high mileage without overpaying for the marketing hype.

I've used Castrol EDGE 5W-30 in my 2020 A3 since day one. It's specifically approved for Audi (meets VW 504.00/507.00 specs) and my engine runs whisper quiet. Changing every 7,500 miles has kept everything pristine according to my mechanic. Worth the extra few dollars over budget brands.

Honestly, Mobil 1 5W-40 has been my go-to for years. My mechanic says it provides better protection for our hot summers, especially if you do short trips or city driving. Yes, it's more expensive, but my engine runs smoother and quieter compared to when I used cheaper oils.