Today the car's computer alerted me to the fact that my engine oil level was low so I stopped at the nearest gas station (a Marathon) and searched for 5W30 Fully Synthetic Motor Oil... The only brand they carried was "Peak" which I'd never heard of before... I know BMW recommends Castrol brand... Just wondering if all motor oils are "created equal" or if I should have gotten the recommended brand. I figured as long as it was the right type I would be good. Also, the "Measuring Engine Oil Level" took forever and by the time I got home it was still calculating the level. Please, my esteemed F07 forum members, share your experiences and preferences for refilling motor oil.