[No.401_Speed]

I changed the oil in my F82 and E92 a week ago.

I bought two 5 liter jugs of Castrol 5w40 for the M4 and two 4.4 liter jugs of Castrol 5w30 for the E92. When I was finished, I drove the E92 into town and when I returned I checked the oil and it showed that I was down 1 liter.

The mistake I made, and you made have made as well, was in subtracting 6.5 liters from 10 liters leaving 3.5 liters for the M4 change, and then adding oil to the E92 until I had 3.5 liters remaining when filling from the 8.8 liter jugs. I just forgot the difference in total quantity. It was a simple, stupid error, but one that had me scratching my head for a few moments until I figured it out.

Just double check the amount you actually added, versus what you think you added. Might be as simple as that.

I don't believe that this is an oil burning problem. If you were actually burning oil via a broken oil ring on a piston, then you would not fail to notice a significant cloud of blueish white smoke coming from the exhaust.