Could someone please explain me this example of HTHS comparing two oils?
Motul 300V Power 5w40:
Viscosity at 100C: 13.8 mm2/s
HTHS at 150C: 4.51 mPa*s
Castrol Formula RS 10w60:
Viscosity at 100C: 22.7 mm2/s
HTHS at 150C: 3.7 mPa*s
I understand that at 100C, the Motul is more "like water" than the Castrol one. How does the situaiton look at 150C? Does the higher HTHS of Motul mean that at 150C the Castrol is "more like water" than Motul, so it means that the Castrol looses his viscosity with temperature faster than Motul, even if it's viscosity at 100C is higher?
Can I compare the HTHS number directly between these two oils? Or for example HTHS=4 for 5w40 oil is not absolutely the same as HTHS=4 for 10w60 oil? Is the HTHS some absolute number or relative with the viscosity grade of the oil?
Are there any materials about HTHS, it's testing, comparison etc?
Sorry for such basic questions
Motul 300V Power 5w40:
Viscosity at 100C: 13.8 mm2/s
HTHS at 150C: 4.51 mPa*s
Castrol Formula RS 10w60:
Viscosity at 100C: 22.7 mm2/s
HTHS at 150C: 3.7 mPa*s
I understand that at 100C, the Motul is more "like water" than the Castrol one. How does the situaiton look at 150C? Does the higher HTHS of Motul mean that at 150C the Castrol is "more like water" than Motul, so it means that the Castrol looses his viscosity with temperature faster than Motul, even if it's viscosity at 100C is higher?
Can I compare the HTHS number directly between these two oils? Or for example HTHS=4 for 5w40 oil is not absolutely the same as HTHS=4 for 10w60 oil? Is the HTHS some absolute number or relative with the viscosity grade of the oil?
Are there any materials about HTHS, it's testing, comparison etc?
Sorry for such basic questions