2003 330Ci Manual Shift
I'm pretty sure it's 1.3 - 1.5 quartsNormally I would say: only full up the diff with the diff in the car, so you can't overfill. But I do know for a fact these hold exactly 1 liter.
highlighted ventilation in redThanks all. Where exactly is the vent hole? I don't see it on real OEM and haven't found it yet. So far I've just scraped and scrubbed with some kerosene. It's looking a lot better. It's got fresh oil in it so I don't plan to replace it unless I somehow contaminate it. Do you think it is odd that all the flanges, including the input, were so clean compared to the differential, or is that normal because they move?
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i personally would not advise using harsh chemicals to clean like kerosene. it may get on the seals and degrade them. it may also soak into the diff cover gasket (paper on early originals) and eat it up causing leaking.So far I've just scraped and scrubbed with some kerosene. It's looking a lot better.