Bmw 1996 316i i have had the head gasket skimmed

Hi,
Something is wrong with the head to engine connection. The white smoke is water burning from the sylinder(s) and the cream colored oil means you're getting water in the oil... this isn't good. You'll have to remove the head and re-assess this connection. Make sure the gasket is correct to all the water jacket ports and upon reinstallation, follow the correct torque sequence for the head.
I hope this helps, though it's not good news... sorry.