"Warren Performance (just down the street) bottles most of the store brand oils sold in the US. This includes Walmart, Costco, TSC Traveler, All Fleet, Amazon, Peak, Mag 1 and many others."
John,
Doesn't Warren Distribution make Mag 1 motor oil? If that is so aren't all the oils you listed the same products in different packages?
"After 50+ years of messing around with cars, I have come to the conclusion that motor oil is motor oil..."
Frank,
Are you saying that they all have the same additive package and quality or only that they all fit the broad category of "oil"? What is the science behind the statement?
According to buckaroo01 he learned from a lubrication engineer that there are differences:
"I took the suggestion by Yar and called the Shell Oil Lubrication Engineer and he cleared up the question of which motor oil is best in older engines. He said that older engines need Zinc and he suggested to use Rotella T4 15W-40 diesel motor oil as it contains 150% more zinc than motor oil for gasoline engines."
Over the decades I've seen many automotive publications that say the same things that the lubrication engineer told buckaroo01 and provide the details of the differences.
Ray W
