How often should I change the engine oil in my BMW M1?

I just bought a used BMW M1 and I'm not sure how frequently I should be changing the engine oil. Any recommendations?

The engine oil in your BMW M1 should be changed every 10,000 miles or once a year, whichever comes first.

To ensure optimal engine performance, I would recommend changing the oil every 6 months or every 7,500 miles.

I have a BMW M1 as well and I personally change my oil every 5,000 miles. It's a bit more frequent, but it gives me peace of mind.