I am only a chemist on the internet...
There is alot of info on the internet regarding motor
oil, viscosity, etc. etc.
The link below could be a benefit in understanding some of the concepts of motor
oil (especially regarding viscosity VI).
We all have our preferences for cars, motor
oil, engines, etc. etc. I have found my preference for motor oil for my Cobra.
I hope readers find the link useful.
http://zddplus.labecon.com/TechBrief...0Viscosity.pdf