Although it's more money, until you've sampled enough to know how your oil responds to extended use, I'd recommend the TBN analysis for an extra $10. The final TBN along with other indications will determine your OCI at which point you know your engine and TBN can support it. After you've established the OCI, you won't need the TBN analysis and will only monitor wear metals and stuff.

Again, sweet cat. If I were choosing, I'd get one like him but I'm thinking of going to the shelter if I do.

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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