Re: CB650 SC Oil Cooler for CB750's

Posted by sgtslag on Jul 02, 2012; 3:01am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/CB650-SC-Oil-Cooler-for-CB750-s-tp3909678p4024126.html

Actually, what you were told is not quite accurate.  There are five different types of oil:  Types I, II, III, IV, and V.  They are not made the same way.  Types I and II are similar, Type III is dino base oil run through a process called "hydrocracking", which is a chemical means of further refinement.  Type IV, as I understand it, is built up, chemically, one molecule at a time, so, No, it is not made from dino base oils, as I-III are.  Type V is a catch-all classification, which encompasses 'everything else', or all of the weird, special purpose oil types.

Take a look at automotive oil, on Wikipedia.org.  They have a very thorough article on the various types, and their differences.  It's a bit complex, but you will get something useful out of it, I believe.  To answer your question, No, they are not the same, and they have different boiling temperatures, different flashpoint temperatures, etc.  Cheers!