[Dave Noll]

Originally Posted by HandOverFist

There has to be some validity to the thinner oil weights overall. Nascar engine builders put way more time and effort into research and actual use of products as well as methods than most ever will. I believe in real world results and won't discount anything without concrete evidence contrary.

Rich,
When you have some time to read, give this a look see. It completely changed my thinking on the subject.

http://www.bobistheoilguy.com/motor-oil-101/