hey p76 rangie :actually the term thin is not quite right , the test for viscosity index is a measure of viscosity NOT density. thinner implies less dense molecular structures therefore more room between molecules. the test is done , if you would have read above , with a diesel injector nozzle 1400psi they try to shear the molecules that way. and then report the oils resistance to shearing. long chain hydro-carbon molecules can break and re form in a million different ways, which is the reason the higher Viscosity oils usually have the lower VI in a family
of oils. of course you live down under where they probably just stick a quart in a crocadiles mouth and see what happens.
|
