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  2. Grashof number - Wikipedia

    en.wikipedia.org/wiki/Grashof_number

    In fluid mechanics (especially fluid thermodynamics), the Grashof number (Gr, after Franz Grashof [a]) is a dimensionless number which approximates the ratio of the buoyancy to viscous forces acting on a fluid. It frequently arises in the study of situations involving natural convection and is analogous to the Reynolds number (Re). [2]

  3. Motor oil - Wikipedia

    en.wikipedia.org/wiki/Motor_oil

    Today, motor oil in the US is generally sold in bottles of one U.S. quart (950 mL) and on a rarity in one-liter (33.8 U.S. fl oz) as well as in larger plastic containers ranging from approximately 4.4 to 5 liters (4.6 to 5.3 U.S. qt) due to most small to mid-size engines requiring around 3.6 to 5.2 liters (3.8 to 5.5 U.S. qt) of engine oil.

  4. Base oil - Wikipedia

    en.wikipedia.org/wiki/Base_oil

    Originating in 1993, the most refined grade of petroleum base oil, since they are fully produced by hydrocracking, hydroisomerization, and hydrotreating, [7] which make these oils purer. 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 ...

  5. Two-stroke oil - Wikipedia

    en.wikipedia.org/wiki/Two-stroke_oil

    The oil is dyed blue to make it easier to recognize in the gasoline. It appears black in this bottle because it is not diluted. Two-stroke oil (also referred to as two-cycle oil, 2-cycle oil, 2T oil, or 2-stroke oil) is a special type of motor oil intended for use in crankcase compression two-stroke engines, typical of small gasoline-powered ...

  6. Viscosity index - Wikipedia

    en.wikipedia.org/wiki/Viscosity_index

    Thus the issue of multigrade oils came into being, where with variable temperatures of, say, −10 °C during the cold nights and 20 °C during the days, a 5 weight oil would be good as the oil would be pumpable in a cold engine and as the engine came up to running temperature, and the day warmed up, the characteristics of a 30 weight oil would ...

  7. Motor Oil Hellas - Wikipedia

    en.wikipedia.org/wiki/Motor_Oil_Hellas

    Motor Oil Hellas was founded on May 7, 1970, by Vardis Vardinogiannis and Georgios Paraschos Aleksandridis. It is headquartered in Marousi, Greece. [1] Since 1972 Vardis J. Vardinoyannis has been chairman and managing director. [7]

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