Backdraft book says use 20w50 oil

[cbreez]

Originally Posted by Bxx1

It has a VI index of 185. Most true synthetic oils have a VI above 165. Generally, the higher the VI the higher quality synthetic oil.

Oh really, explain why??? Are you a chemist? What does VI mean to you? So more is better, eh?

[Bxx1]

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

[eedeutsch]

My engine builder recommended 20w50 in summer and 10w40 in winter. He did
not specify any particular brand.