SWEPCO 729 Premium Flushing Oil is a light mineral oil especially formulated for purging oil systems before switching to a SWEPCO High Performance Lubricant. Use of SWEPCO 729 helps insure optimum performance from any SWEPCO Compressor Oil, Transmission Fluid, Hydraulic Fluid, Industrial Oil, Gear Oil or Engine Oil. Simply draining old lubricants does not entirely remove the old lubricant from the system. Intricate oil passages, reservoirs, fluid lines, cylinders, accumulators, pumps, separators, coolers and other oil system components can retain residual oil that can contaminate new SWEPCO Lubricants. A brief flushing cycle with SWEPCO 729 insures more complete elimination of old lubricants from the entire system. This is especially critical in compressor changeovers. It also removes loose deposits so they will not have a negative effect on compressor efficiency or operation. While SWEPCO Lubricants are compatible with all mineral oils and most PAO lubricants, you will not obtain the full benefits of SWEPCO’s High Performance additive chemistries if they are contaminated with old lubricants or loaded with deposits left behind by old lubricants. Flushing is a good way to remove all old lubricants and remove the loose contaminants that might affect the service life or performance of SWEPCO Lubricants. Because most synthetics are NOT compat- ible with SWEPCO Lubricants, flushing is highly recommended whenever switching from a synthetic product to a SWEPCO Lubricant. Finally, flushing is highly recommended for ANY compressor changeover or whenever other types of components (transmissions, hydraulic systems, gear box, differentials, final drives or engines) are old, known to have heavy deposits or contamination or have demonstrated operational deficiencies.