the origional owner of my ML320 used a quart every 1,000 miles for 70,000 miles. he used regular gas.
i use mobil premium and use -0- oil . i have 120,000 miles.
when regular gas is used,,the computer retards the timing and sends the emmission controls out of wack and oil consumption happens.

__________________
Steve Danville
what i did myself.
CPS
rear shocks
MAS x 3.
SparkPlugs (twice)
Fuel pump & Filter
Window switch
replaced both failed horns with Honda horns.
Cleaned ERG Tube
Oil changes
Oil consumption Fix
Brake Pads
A/C Recharge
Anti-Freeze change X 2.
Front Shocks. Monroe. $90
Mercedes Warrenty Work:
Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s
Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles