Is that the Amway that my neighbors wife was always bothering me to buy? who knew? just a joke I know what you meant. 10yr old SG dino oil is better than the the modern tree hugger dino oil of today. and most 1959 ford 9 inch lasted so long was because it was such a good rear end with a extra pinion bearing and 200 hp.
Funny, this new veggie oil recently was rated one of the very best available:
"4. 5W30 Renewable Lubricants, Bio-SynXtra, Super High Performance motor oil = 130,436 psi
This patented biobased motor oil uses agricultural vegetable oil base stock, and is biodegradable.
The psi value of this oil, which came from testing it at the normal operating test temperature of 230*F, put it in the FANTASTIC Wear Protection Category.
I also went on to test this oil at the much higher temperature of 275*F. At that elevated temperature, any hotter and thinner oil is expected to experience a drop in Wear Protection Capability. This oil had only an extremely small 0.7% drop in capability. Even at that elevated temperature, it produced 129,486 psi, which still kept this much hotter oil in the FANTASTIC Wear Protection Category.
I also tested this oil for its onset of thermal breakdown point, which was 275*F.
This was the first biobased motor oil I ever tested. And its performance was EXTREMELY IMPRESSIVE. These results probably surprise a lot of people, since this oil wasn’t even made from petroleum base stock. So it appears, there could be a very bright future for biobased motor oil, if they are formulated well.
And the test data produced by this biobased oil, further backs up what I have said about a motor oil’s “base stock” NOT being all that critical, it is the “additive package” that IS critical."
Wow, very impressive but is $13.50 a Qt... Now just make it $25 a jug and I'll use it for life!
Edit: Less than $10 qt on Amazon and, not bad!