Not being up on my oil technology or chemistry, how do you tell if a particular synthetic oil is of a high quality? The oils in question are Petro-Can's Duron (heavy duty diesel) synthetic and their Synthetic Passenger Car oil. I have downloaded as much technical info from their website as I thought neccesary. Is the total base number the one to be looking at? For the Duron synthetic 5w40 it's 10.9 and for the "synthetic passenger car oil" 5w03 it's 7.6
I'm wondering what group these oils are. There was some info in the gas engine oil section of this site but I keep getting flashed-over to this "DO YOU MAKE THESE OIL CHANGING MISTAKES? CLICK HERE" page every time I try to go back there.