How many miles on that 2.8 liter 6 cylinder BMW ? What year ?

My last BMW was a 540I and I fueled it with 87 Octane every time even though it called for 92, it ran perfectly fine.

When I hit 140,000 miles the Check engine light came on. The local Auto parts store re-set it for me but it came back on 3,000 miles later. We traced it to a oxygen sensor.

My car had 2 so I replaced both at the same time and the light went away.

Sold that car with 150,000 miles. That V8 was the Ultimate driving machine.

I now drive a V6 and it's not the same.