sounds like you're on the wrong forum.

BMW does recommend the 15k specs because they have to be able to offer a "no cost maintenance" plan for the life of the warranty. As opposed to Toyota who did a "toyota care" with 10k intervals for life of the warranty. It's all about competition.

I recommend 5-7k max OCI or once a year whatever comes first. Main reason why I won't be buying new bimmers used, the maintenance schedule is terrible. You think a brake fluid drain/flush is included on the 4 year 50k maintenance plan, even though its recommended every 2? Absolutely not.

Sure these Bimmers require more maintenance than a Honda CRV but if you actually drove one of those you would understand what falling asleep behind the wheel means....

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards