Engine oil LIQUI MOLY or PENNZOIL
Put about 300K on two different M54's so far. Originally Mobil1/Castrol 0W30 (that was the original BMW recommendation in early 2000s), eventually switched to Pennzoil Euro 5W40 for oil leak reduction.
I run LM 5w-40 as recommended by my tuner.
I just do the liqui moly. Also I change my oil well before the BMW recommended 10k.
I switched to Pennzoil Ultra Platinum full synthetic made from natural gas. Oil consumption is 1/2qt in 5K.
I flip between Pennzoil Ultra Platinum and Motul depending on if I choose to order ahead of time or just do it when I feel like.
Pennzoil Platinum Ultra is also commonly used/recommended instead of the Motul and is cheaper.
I always use Penzoil Ultra Platinum and have never had an issue.
I’ve switched to Pennzoil and I’ve noticed I went from burning about ~1 quart between 5k mile changes to barely burning anything. It seems like my motor is a little happier with it based on it not making such a racket but that might just be confirmation bias
I often go for liquymoly or Motul 4t 10-w40 fully synthetic oil for my big machine.
LiquiMoly oil is the best. Top tec 6310 0w30 is what I use for the THP.
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