Redline recommended 10w-40 Full Synthetic for my 1.8 solid lifter JH turbo application and the tech guy suggested modern synthetics don't cause seal leakage (like OG synths of 25 years ago) and holds up way better than the 40w rating in hot temps and protects much better when cold than even the current crop of Castrol 20/50 dino oil I was running. I swapped over the M81 to the same Redline oil and have not yet noticed any new oil leaks yet.
I ran Mobil 1 20w/50 for 24 years. The guys at NGP use Liqui Moly everything so I switched after reading up on it. I'm REALLY liking Liqui Moly since I switched 3 years ago.
I'd go with [Liqui Moly Leichtlauf 5W40.](https://www.fcpeuro.com/products/vw-oil-change-kit-5w-40-liqui-moly-kit)
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.
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.
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