viscosity index การใช้

• The Viscosity Index of synthetic oils ranges from 80 to over 400.
• Pennsylvania grade crude oil is thermally stable and has a high viscosity index.
• A number proportional with the value of this torque is taken as viscosity index ( Mooney viscosity ).
• Additives deliver reduced friction and wear, increased viscosity, improved viscosity index, resistance to corrosion and oxidation, aging or contamination, etc.
• Afton Chemical offers engine oil additives for passenger car, motorcycle, medium speed diesel and heavy-duty engines, as well as olefin copolymer viscosity index improvers.
• This leads to a change in transmission performance and so where unwanted performance / efficiency change has to be kept to a minimum, a motor oil or automatic transmission fluid, with a high viscosity index should be used.
• API defines group I as " base stocks contain less than 90 percent saturates and / or greater than 0.03 percent sulfur and have a viscosity index greater than or equal to 80 and less than 120 ".
• API defines group III as " base stocks contain greater than or equal to 90 percent saturates and less than or equal to 0.03 percent sulfur and have a viscosity index greater than or equal to 120 ".