Mobil 1-CASE 5W-40 Formula M Motor Oil - 1 Quart Bottle, (Pack of 6) Mobil 1 Formula M 5W-40 is approved for Mercedes Benz MB-229.5. Helps reduce poisoning of gasoline catalytic converters Helps reduce deposits and sludge build-up to enable long and clean engine life Helps reduce oil aging allowing extended drain interval protection