The 2.0 liter gas/petrol engine is the weak link here, due mainly to poor piston ring design. We are third owners of a '14 A4 6MT, purchased in mid '17 with 48K miles. We're at 98K miles now, and with 5K engine oil changes using Liqui Moly or Elf/Total fully synthetic, we use a small nominal amount of engine oil between changes.
Reviews of LIQUI MOLY engine oil
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i use liqui moly 5w30, the european formula. it says made in germany, its the best during winter.
Liqui Moly Specifically Liqui Moly 2332 Leichtlauf High Tech 5W-40 Engine Oil - 5 Liter
I use LiquiMoly 5W-40, no issues.
Even tho the other oil also meets the minimum requirements the manufacturer suggests, paying the few extra pennies for even better oil is always worth it.
My 2013 GTI I believe has been running off of 5w-40 since I bought it. Supplied a shop with European 5w-40 and it still ran fine. Now it's winter, 6-12F outside and I just got the oil changed at a local drive and shine to 5W30 full synthetic and the GTI is running like garbage! RPMs are staggering all over when it goes into neutral, instead of 750RPMS it likes 1k to be normal. It just overall feels wrong.
I've noticed my mk4 2.0 AZG with 250k miles uses 1.5-2 quarts of Mobil 1 in between 4k mile oil changes vs 1L of liqui moly.
When I put Mobile 1 (found a killer deal $$$) in my Golf, I noticed a bit more engine noise vs LiquiMoly. I'd say you'd be fine with both, but the nod goes to LiquiMoly if you want a very quiet engine.
I use it in my MK4 1.8T. Tuned with 212K miles on original engine and turbo. Still going strong, no complaints.
Therefore, although I have used Mobil1 synthetic oil exclusively in all my vehicles for more than 30 yrs, and even though M1 0W40 is VW 502 approved, it is not the recommended viscosity, so I now use Liqui Moly Leichtlauf high tech 5W40.
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