Personally I buy exactly the factory oil, from a manafacturer that factory put in, in German cars it's Castrol, French are Total and Elf, Italians use Petronas Selenia.
Amsoil is top tier oil and you can't go wrong with it.
I’m using Amsoil 0w-30 and am very pleased with it. Getting about 1 mpg better gas mileage and had the Amsoil lab analyzed after 3500 miles and numbers are better than what the factory oil showed. All added up, the Amsoil was better at protecting the engine.
My r53 loves Castrol 5w40 and Mann/Mahle filters.
Castrol Edge, I have used it forever in both my vehicles and I 10/10 reccomend it.
I used Castrol magnatec 5w30 Fully synthetic every 6-7k Miles.
I used Castrol edge 5w40 euro car when I had my car.
I run Castrol Edge in my VDub. It's the European blend that is approved by VW as shown on the back of the jug.
I use Castrol R, smells great and reminds me of riding 2 stroke bikes from my younger days.
I personally used to run mobil 1 0w-40. as you said its super thin and seemed to just barely get the job done. Recently switched to castrol SLX 5w-30 and I am decently pleased with the first two changes.
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