Date registered: Feb 2008
Vehicle: 2004 W220 (S430) ; 2001 R129 (SL500) Sport
Location: Alabama Gulf Coast--formerly Charlottesville, VA
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I've owned 4 Mercedes: a W108, W124, W200, and R129. I own the last two now. The first two I kept to 150k. I've never had one burn a measurable amount of oil between changes.
For most cars, burning a quart of oil every 3-4k miles is normal. That would be 3-4 quarts in a change for a MRZ that uses synthetic oil and extended change intervals.
"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck