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Castrol EDGE 0W-40 European Formula (made in Belgium) synthetic is good high quality LL01 oil for the N54. I typically use 1/2 a quart or less between oil changes (~7500 miles or once per year, whichever comes first). This is a higher quality Group IV oil than other US manufactured Castrol synthetics that are typically hydro-cracked Group III oil. I used to use Mobil 1 almost exclusively in vehicles prior to my 335i.
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