Lubricant grade reference table and common misconceptions regarding the use of lubricants

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Lubricant grade comparison table: Lubricant viscosity at 40°C according to ISO-VG, in mm2/s. Standard: DIN 51519. Examples of lubricant selection: Refrigerant oils, compressor oils. Photos available at www.cpihualai.178b2b.com. Contact Mr. Wang: 13926549484; QQ: 932929010, 1123686569. Synthetic oils: 1) VG1000: Degol GS1000, TRIBOL800/1000, Optiflex A 1000; VG680: Degol GS680, Polydea PGLP680, Glygoyle HE 680, TRIBOL800/680, Optiflex A 680; VG460: Degol GS460, Enersyn SG-XP460, Polydea PGLP460, Glygoyle HE 460, TRIBOL800/460, Optiflex A 460; VG320: Degol GS320, Glygoyle HE 320, TRIBOL800/320, Optiflex A 320; VG220: Degol GS220, Enersyn SG-XP220, Polydea PGLP220, Glygoyle30, TRIBOL800/220, Optiflex A 220; VG150: Degol GS150, Polydea PGLP150, Glygoyle22, TRIBOL800/150, Optiflex A 150; VG100: TRIBOL800/100. Mineral oils: 2) VG1000: TRIBOL1100/1000, Optigear BM 1000; VG680: Degol BG680, Enersyn GR-XF680, SPARTANEP 680, Mobilgear636, TRIBOL1100/680, Optigear BM 680; VG460: Degol BG460, Enersyn GR-XF460, SPARTANEP 460, Mobilgear634, TRIBOL1100/460, Optigear BM 460; VG320: Degol BG320, Enersyn GR-XF320, SPARTANEP 320, Mobilgear632, TRIBOL1100/320, Optigear BM 320; VG220: Degol BG220, Enersyn GR-XF220, SPARTANEP 220, Mobilgear630, TRIBOL1100/220, Optigear BM 220; VG150: Degol BG150, Enersyn GR-XF150, SPARTANEP 150, Mobilgear629, TRIBOL1100/150, Optigear BM 150; VG100: Degol BG100, Enersyn GR-XF100, SPARTANEP 100, Mobilgear627, TRIBOL1100/100, Optigear BM 100. Gear greases: Aralub FD 00, FDP 00, Energrease HTOHT 00, EPOrona 00, Orona FG EP 0, FIBRAX EP 370, MICROLUBE GB 00, Mobilplex 44. Special gear greases: H, multi-functional greases: TRIBOL5000, Wiolub GFW, Longtime PD 00. Lithium-based soaped anti-friction bearing greases: Aralub HL27, Energrease LS3, Glissando 20, Glissando 30, BEACON 3, CENTOPLEX GLP 402, Mobilux 2, Mobilux 3. Greases R3A, Wania Fett G3, MOLUB-ALLOY BRB 572, Wiolub LFK 2, Longtime PD 2. 1) Synthetic gear oils (polyethylene glycol): Classified as PG according to DIN51502 standard. This type of lubricant possesses excellent anti-aging properties, which can effectively improve the mechanical efficiency of gearboxes. The operating temperature range is from –20°C up to +90°C (with temporary peaks of 110°C). 2) Mineral-based gear oil is designated as CLP according to the DIN51502 standard. Such lubricants can meet the minimum requirements specified in Part 3 of DIN51517. The operating temperature range is from –10°C to +90°C (with instantaneous temperatures reaching 100°C). Misconceptions about the use of lubricating oil (1): It’s better to use more lubricating oil than too little. During the operation of equipment, adding too much engine oil can have certain adverse effects, especially on port equipment that operates under heavy loads at high speeds. In the case of air compressors, excessive oil in the crankcase increases the resistance to the movement of the crankshaft ； In the reduction gearbox, in order to reduce the mechanical resistance of the gears and prevent excessive oil temperature, the depth to which the gears are submerged in the oil should be 1 to 2 tooth heights ； When greasing a rolling bearing, generally only 1/3 to 1/2 of its space needs to be filled ； If too much oil is added to an air compressor, oil slugging can occur during operation; when the temperature rises, carbon deposits form, and the combustion of these deposits can lead to explosions. 　　(2) Oil with higher viscosity is more beneficial for the engine than oil with lower viscosity. The higher the viscosity, the thicker the oil film between the surfaces of the moving parts. While this helps to prevent surface wear, it also increases frictional resistance and thus power loss. Experiments show that, under conditions ensuring proper lubrication, using low-viscosity lubricants not only saves fuel but also minimizes engine wear. 　　(3) Using high-viscosity engine oil can solve the problems of weak engine performance and oil leakage. Weak engine performance, high oil consumption, and oil leakage are external signs of deteriorating engine condition. Using high-viscosity oil not only fails to resolve these problems but also reduces the performance of the engine’s lubricant, thereby accelerating engine wear. 　　(4) Select the oil strictly in accordance with the specifications provided in the equipment’s user manual. The oil specified in the equipment operation manual refers to the oil used under normal operating conditions. If the actual operating conditions are more severe than those specified, a higher-grade oil should be selected through testing, or the oil change interval should be appropriately shortened. 　　(5) If the lubricating oil turns black, it indicates that the lubricating oil has deteriorated. It is normal for diesel engine oil containing detergent dispersants to turn black after short use, and it should not be replaced hastily ； Lubricants with additives often cause a dark black protective film to form on the bearing surface ； It is normal for thickened engine oil to turn black over time or for the oil pressure to be low during use. 　　(6) Full-shaft lubrication yields better results than hollow-shaft lubrication. Practice has shown that for the hub bearings of loading and unloading machinery, lubrication with an empty hub is the best approach; that is, a thin layer of grease applied to the inner cavity of the hub is sufficient to prevent rust. Full-shaft lubrication not only wastes grease but also tends to increase internal friction and raise bearing temperature, leading to the loss of grease. In severe cases, the lost grease seeps into the braking system, causing the brakes to fail. 　　(7) There is no need to be too strict when collecting test oil samples. Oil sampling should be carried out after the equipment has completed a working cycle and when the oil and water temperatures are at normal levels. When taking samples, priority should be given to collecting the grease at the sampling valve; if this is not possible, an oil gun or a tube can be used to reach into the oil pan to obtain the sample. The sampling depth should be 30–50 mm below the oil level, and the sample should be analyzed immediately. 　　(8) Used oil cannot be reused. If the replaced oil is still in good condition, it can be used in equipment for rough processing after slight treatment. U.S. CPI Oil King: 13926549484 Website: www.cpihualai.178b2b.com