Manufacturer limits are always silly so that you cannot claim on anything but a 'due to expire' engine

Should run a E39 M5, now they use oil as much as fuel and its normal

Sounds like the dealer underfilled in the service , esp if you never saw the light before.
Obv check for serious leaks too!
Using oil (esp during running in) is not a bad thing , I guess its changing oil usage habits you should worry about.
I ran mine in 'vigorously' and expected some usage but its been next to nothing so far. (8k)
Let it warm up , thrash it , and check regularly
