What is the viscosity of 20w/50 motor oil?

Im doing some A-level physics coursework about gravity and drag etc...


thanks for you timeWhat is the viscosity of 20w/50 motor oil?
SAE 30. The viscosity in centistokes (cSt) @ 100 degrees C is within a minimum of 9.3 cSt and a maximum of 12.5 cSt.





SAE 40. The viscosity @ 100 degrees C is within a minimum of 12.5 cSt and a maximum of 16.3 cSt.





SAE 50. The viscosity @ 100 degrees C is within a minimum of 16.3 cSt and a maximum of 21.9 cSt.





I could not find viscosity data for SAE 20 weight oil, but if you look around, I;m sure it's there somewhere.





Anyway, the 20w/50 oil designation means it has the viscosity of a 20W oil at low temperatures (I think -10C is the reference temperature) and the viscosity of a 50W oil at high temperature (100C, I think).





Incidentally, the ';w'; in 20w/50 means ';Winter';, according to Valvoline.What is the viscosity of 20w/50 motor oil?
typical numbers:


Kinematic Viscosity @ 100掳C, cSt (ASTM D-445)


18.4





Kinematic Viscosity @ 40掳C, cSt (ASTM D-445)


115.7





Viscosity Index (ASTM D-2270)


178





CCS Viscosity @ -15掳C, cP (ASTM D-5293)


3605 (-15)