I realize this has been discussed before, but I continue to see the myth perpetuated.
The criticism of dino oil of this grade has been based on the viscosity "spread" and therefore the ASSUMED high amount of VII used.
I believe looking at the viscosity index number is the most accurate way to determine the amount of VII used; as long as your aware of which base oil is used and its' VI.
Usually the same group base stock is used for 5w-30, 10w-30 and 10w-40(based on CAS#s). The viscosity indexs average 140, 150 and 160 respectively(for most brands).
So if anything 5w-30 should be the most maligned, NOT 10w-40!
BUT, with the quality of todays VIIs I don't believe either of these grades would pose a problem for 99% of drivers.
* With all the bad press, someone just joining the forum would be under the impression 10w-40 was EVIL and should be avoided(I know I was). So, I think we need to be a little more clear.
Steve
The criticism of dino oil of this grade has been based on the viscosity "spread" and therefore the ASSUMED high amount of VII used.
I believe looking at the viscosity index number is the most accurate way to determine the amount of VII used; as long as your aware of which base oil is used and its' VI.
Usually the same group base stock is used for 5w-30, 10w-30 and 10w-40(based on CAS#s). The viscosity indexs average 140, 150 and 160 respectively(for most brands).
So if anything 5w-30 should be the most maligned, NOT 10w-40!
* With all the bad press, someone just joining the forum would be under the impression 10w-40 was EVIL and should be avoided(I know I was). So, I think we need to be a little more clear.
Steve