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Chap._300030 - strength and lubrication A thin oil such as...

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* Poly ( -olefins) - PAO (Functional Fluids, Synthetic Lubes) Comparing with Mineral Oils PAO provides better performances - Wide operating temperature - High viscosity index - Thermal stability - Low corrosivity - Oxidative stability - Low toxicity - Hydrolytic stability - Can be "tailored" to applications - Shear stability Saturated Hydrocarbon (PAO) Ni or Pd H 2 Dimer Trimer Tetramer Pentamer High er Oligomers R Cationic polymerization BF 3 /CH 3 OH (x: 1, 2, 3, 4, 5) R R CH 2 =CH H-(CH 2 -CH) - CH=CH x Applications: Motor oils, lubricants,Candles Most modern motor oils are formulated from various grades of oil so the oil will have the best characteristics of both thick and thin viscosity oils. Multi-viscosity oils flow well at low temperature for easier starting yet retain enough thickness and film strength at high temperature to provide adequate film
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Unformatted text preview: strength and lubrication. A thin oil such as a straight SAE 10W oil designed for cold weather use would probably not provide adequate lubrication for hot weather, high speed driving. Likewise, a thicker high temperature oil such as SAE 30 or 40 would probably become so stiff at sub-zero temperatures the engine might not crank fast enough to start. Multi-viscosity grade oils have a wide viscosity range which is indicated by a two-number rating. Popular multi-viscosity grades today include 0W-20, 5W-20, 5W-30, 10W-30, 10W-40 and 20W-50. The first number with the "W" refers to the oil's cold temperature viscosity rating, while the second number refers to the oil's high temperature viscosity rating....
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