It's perfectly fine to be concerned about putting the right oil in your car, whether new or 21 years old.

Another thing about manufacturers certs is oil makers pay to be assessed and officially certified. Sometimes they just dont feel like paying anymore. Sometimes the formulation has changed and they have not yet or dont feel like paying to be certified.

Which oil is this? It would be interesting to hear from the manufacturer why it isnt anymore.

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04 X5 3.0i auto
03 X5 4.6is