i painstakingly visited each oil manufacturer's website and brought up the "PRODUCT DATA SHEET". then i make a list and compared them all...yeah i have a life... no i just felt that was the only way to truly find out. I visited castrol's website and found almost all their oils have data missing from the viscosity index column... whats that say? to me that says it was a number that they'd rather not share with us. checked all the oils i could dream up... but there are so many you know? Hint: the PDS can be easy found , it usually has an adobe reader logo next to it...although some companies have required extensive digging to get to the real facts... i think my choice because of the age of my vehicle , is the philipps 66 i can get 10w40 for a buck fifty a quart!!! and a viscosity index of 150 is exceptional, their non-marketing no frills packaging works for me.
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