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Oil is an endless debate. Castrol was BMW's preferred, then it was Pennzoil, others said Liqui-Moly is good for preventing sludge, etc etc.
A typical m54b30 burns about 1L/1000km. I found that I burnt the most oil (5W40) on Liqui-Moly, then Castrol, then Pennzoil. Now I run Rotella 5W40, and its about 1L/2000km. Not too bad. Rotella is pricier, but at least i dont have to worry about not having oil every time I go out LOL.
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