The harder you drive your M5 the more oil it'll consume, just think of it as the price of admission.

Following is a log of my M5's oil consumtion: (Odometer Trip Description)

• 3100mi 3100mi Cross country breakin trip (NJ to CA), followed instructions
• 4200mi 1100mi 50/50 Hwy/City, still a bit easy on the pedal
• 5150mi 950mi 50/50 Hwy/City, "Can you say Red Line ?"
• 6700mi 1550mi 75/25 Hwy/City, not so many Red Line shifts
• 8300mi 1600mi 80/20 Hwy/City, again, tak'n it easy
• 9200mi 900mi 50/50 Hwy/City, run'n 94 Octane, "Yah Baby"
• 11000mi 1800mi 50/50 Hwy/City, run'n 94-96 Octane, some hard driving
• 13025mi 2025mi 75/25 Hwy/City, couple of 500mi hwy trips
• 13707mi 682mi 50/50 Hwy/City, run'n 96 Octane, too many "is that M5 fast ?"
• 14101mi 394mi 25/75 Hwy/City, man that Dinan exhaust sounds good :-)
• 14700mi 599mi 50/50 Hwy/City, a few tanks of 100 Octane
• 15500mi 800mi 50/50 Hwy/City, dealer diagnosed leaking valve cover gasket but had to order, oil change.
• 18060mi 2560mi 70/30 Hwy/City, valve cover gasket replaced worked !!!
• 19050mi 990mi 50/50 Hwy/City, lead foot
• 19930mi 880mi 50/50 Hwy/City, lead foot
• 20620mi 690mi 30/70 Hwy/City, Hummm, not that much of a lead foot ?
• 21440mi 820mi 30/70 Hwy/City, normal daily commute
• 23200mi 1760mi 80/20 Hwy/City, 1000mi road trip
• 24700mi 1500mi 70/30 Hwy/City, 500mi road trip
• 25472mi 772mi 50/50 Hwy/City, normal daily commute (1:1 91:100 Octane)
• 26570mi 1098mi 50/50 Hwy/City, normal daily commute (back to 91 Octane)
• 27780mi 1219mi 70/30 Hwy/City, normal daily commute with more hwy driving
• 28800mi 1100mi 50/50 Hwy/City, normal daily commute
• 29500mi 700mi 50/50 Hwy/City, normal daily commute, oil change
• 31500mi 2000mi 50/50 Hwy/City, normal daily commute
• 33500mi 2000mi 50/50 Hwy/City, normal daily commute
• 34500mi 1000mi 50/50 Hwy/City, lead foot