One other point: the factory doesn't recommend topping off the oil to try to keep it at the 'full' mark. There was a TSB a few years back recommending keeping the level between the two marks. I've found that trying to keep the level at 'full' makes you chase your tail -- many MB engines will somehow 'use' oil until they find a level they like, which seems often to be about halfway between the marks. My M119 certainly does this. I used to be alarmed by how quickly it'd drop from 'full' to the halfway mark. Now, when I change oil, I aim for the halfway mark, and never have to add oil between 5000 mile Mobil 1 oil changes.

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Steve
'93 400E