Abstract: A method of performing a cleanup service on an internal combustion engine. The method involves draining used fleet oil from the engine, filling the engine with cleanup oil, draining the cleanup oil after an operation interval, and filling the engine with fresh fleet oil. The method can be performed as a remedial measure for an engine already exhibiting high oil consumption, or as a preventative measure on a healthy engine.

Abstract: A method of performing a cleanup service on an internal combustion engine. The method involves draining used fleet oil from the engine, filling the engine with cleanup oil, draining the cleanup oil after an operation interval, and filling the engine with fresh fleet oil. The method can be performed as a remedial measure for an engine already exhibiting high oil consumption, or as a preventative measure on a healthy engine.

Abstract: Oil pan assemblies and methods of draining oil pans are disclosed. An example oil pan assembly includes an oil pan defining first and second sumps. The first sump has a first lower surface and the second sump has a second lower surface. The second lower surface is elevated along a vertical axis relative to the first lower surface. The oil pan assembly also includes a siphon tube extending from an inlet positioned in the second sump to an outlet positioned proximate a drain hole in the first sump. The siphon tube is configured to automatically transmit oil from the second sump to the first sump upon oil being drained from the drain hole.

Abstract: A compressor having either an axial or radial stage adjacent the air inlet includes a circumferential row of slots in the inner casing wall, the slots opening into the casing bore; a rotor having a leading row of compressor blades thereon rotatable within the bore with the tips of the blades adjacent the row of slots; and, the axial centerline of the circumferential row of slots being positioned axially forward of the axial centerline of the blades of the leading blade row with a substantial portion of the axial slot length of each slot being forward of the leading edge of the blades of the leading blade row. In a preferred form of the compressor, the inner casing wall includes a circumferential stationary ring having an inner wall for defining with the inner casing wall the bore in which the rotor rotates, the circumferential row of slots being formed in the ring wall.