stick with vw 508/509. Mobil 1 ESP x2 0w-20 is like $27 at walmart and is 508/509.... Also, 508/509 has a tracer in it so if you need engine warranty work and they drain the oil, they'll be able to tell.
Best Engine oil for Audi S4
I run LiquiMoly Top Tec 6200 0W-20 and have for years. Currently on Stage 2 91 Octane 2019 B9 S4. No problems at all.
I use the LiquiMoly in my S4 but regardless anything that meets the spec on the list is probably fine.
I used that in my B7 Audi S4. Great choice. It’s good stuff.
To be honest, the mobil 1 ESP 0w-20 is a fantastic oil and meets those specs and is at walmart for $8/qt
M1 ESP is arguably the best oil out there. It does not shear fast, doesnt degrade with 5% fuel dilution.
Liqui Moly oil is the gold standard that alot of Audi guys use.
We use the 5w 40 leichtlauf in the b8 S4 and a3 8v. Helped with the s4 oil consumption a great deal over the euro castrol edge used previously.
If you're skeeved out and want to return it, I usually go with the knuckleheads over at [ShopDAP.com](https://ShopDAP.com) (love their VW/Audi YT channel too). They seem to be Liqui-Moly fans and have kits for the Golf and other 1.8TSI vehicles that you can buy. I use Liqui-Moly 5W-40 and it works great, if maybe slightly pricey. I used to use Mobile 1 0W-40 Euro Car Formula in my old Audi S4 and it would probably work OK in these engines too but I wanted to stick with 5W-40.
I do every 5k (2013 S4)
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