Is there any conventional methodology (without visco meter) to measure the viscosity of oils?
Ostwald viscometer
You can see the article of metrology of viscosity.
J. Chem. Eng. Data 2009,54 171-178.
Maybe of some interest concerning to your query: https://www.researchgate.net/post/how_to_calculate_viscosity_of_motor_oil_at_different_temperature
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through origin software
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https://en.wikipedia.org/wiki/Viscosity
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