Quote:
Originally Posted by SkiFly01
I wish I could find the OG data but I did read something about the oils and their sheer factor # and it was something along the lines of:
Mobil 1 15w50 - 13,000
Liqui Moly 10w60 - 18,000
BMW/Shell 10w60 - 22,500
That can be directly related to the amount of Zinc in the oil, so it would be interesting to see where the Valvoline VR1 oil stands up against them. After reading that article though, it's why I have stayed with the BMW oil for the change intervals. YMMV  |
I'm not sure I understand the connection between zinc and shear. A better way to gauge an oil's shear resistance is:
HTHS (already @ 150 C)
------
Dynamic Viscosity @ 150 C
Higher numbers are better, but this is only an approximation. You will need to calculate the dynamic viscosity by multiplying the kinematic viscosity @ 150 C by the density (which is already measured at 150 C).
TWS, for example, has shear resistance of about 0.81, but Red Line 5w30 is 0.92. A few of the Motul 300V and Renewable Lube choices are 0.88-0.95!