Excess oil consumption in engines can be caused by worn piston rings and crankshaft oil seals, but not by a cold running engine.
Excess oil consumption can be caused by various factors in an engine. Worn piston rings allow oil to pass into the combustion chamber and get burnt along with fuel, leading to excessive consumption. Additionally, worn crankshaft oil seals can result in oil leakage, contributing to higher oil consumption. However, a cold running engine is not typically a cause of excess oil consumption as it doesn't directly affect oil usage.
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