sists of substituent groups and succinic groups, and the substituent groups are derived from polyalkenes characterized as having an Mn value of from about 700 to about 5000, and (C) from about 0.01 to about 0.5% by weight of at least one demulsifier characterized by the formula wherein R is an alkyl or alkenyl group containing from about 9 to about 25 carbon atoms, and R* is hydrogen or an alkyl g