Nice cat! Looks like some Maine coon in him. Especially given his size already.

I use Blackstone Laboratories who ard linked to above. Your first few will just tell you the condition of the oil itself at different mileages. You don't even have to necessarily change the oil at sample time. You can draw from the dipstick (on the X5d) or partial drain. I like to let it drain for about 20 seconds prior to drawing the sample, though.

Blackstone will recommend an OCI once the condition of the oil is known and as a specific trend develops. You can take it or leave it. You'll at least be aware. I just like data.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim