I just picked up an X5d and after a bit of research on what oil to use given I'll be towing a heavy load a fair amount, I settled on Motul X-Clean Gen 2 5W-40. Normally, I'm an off-the-shelf at Walmart kinda guy (Castrol 0W-40 in my gassers), but I think this will be a better choice for my situation and I found a decent price on Ebay.... https://www.ebay.com/itm/23399646620...53.m1438.l2649

AM.

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E70 2010 3.0 M57 AT Titanium Silver with Black Leather
E53 2004 3.0 M54 AT Toledo Blue with Gray Leather
E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl
E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten)