You can't go wrong with the Amsoil XL. I run OE 5w30, which offers plenty of protection for a stock engine. Unless your tolerances and clearances have changed, there is no reason you need 5w40. Modern synthetics, especially ones designed for the extra heat of a turbo, are outstanding oils.
Liqui moly
In the past I always swore by Amsoil or Mobile 1.
It looks like even with the mileage difference, Amsoil still outperformed in most categories. Pretty impressive.
As long as it meets the spec for the engine it doesn’t matter. I use Liqui Moly personally.
Running Liqui-Moly in my E46 M3, so far no complaints. Have put ~2k miles in the last 10 months, and the oil hasn’t been burning/leaking whatsoever!
I run LM on my track car and it’s fine . Drive 2.5 hours , beat the living shit out of it, drive home no issues
For 10W-60, if you compare the data sheets of every one available the Liqui-Moly is the closest in spec to the original Castrol TWS that the engine was designed for. That's why I stick with the LM after BMW and Castrol parted ways. Been using it in my cars and clients for 10 years now.
I have 6500 miles since my last change and the oil still looks clear/clean. 2018 GTI, MT, 360HP. I get on the car hard at times with NO change in temp's.
Every BMW I buy used, 2 cans of molly flush and then Liquid Molly oil. You can feel the engine loosed up, quiet down and work great.
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