Can I put Ford oil in a BMW?

My BMW E46 330i needs a slight oil top up and I have some Ford 5w30 fully synthetic oil laying around. The Ford oil says it's Acea A1/B1 compatible but most BMW forums I read says it should use Acea A3 rated oil. Is there that much difference or could I use this oil to top it up with no harm we are only... show more My BMW E46 330i needs a slight oil top up and I have some Ford 5w30 fully synthetic oil laying around.
The Ford oil says it's Acea A1/B1 compatible but most BMW forums I read says it should use Acea A3 rated oil.
Is there that much difference or could I use this oil to top it up with no harm we are only talking from the min to the max of the oil dipstick?
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