paper machine oil - premium lubricant formulated to perform dependably under the hot, wet conditions of paper machine operation. The oil must have outstanding resistance to oxidation and thermal decomposition, potent detergency to prevent deposit build upon hot surfaces, and excellent demulsibilitv and rust protection. It also must be readily filterable through filters with porosity as fine as six microns. These features, derived from a careful blending of additives and high-quality base stock, are essential to extending equipment life and reducing costly unscheduled downtime. See detergent, rust inhibitor, thermal stability.