Quote:
Originally Posted by Roc Doc
It was their contention at that time, that their product was fully synthetic, and that Mobil 1 was from petroleum stock. I don't know if that has changed over the years or not.
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I don't know about 25 years ago, but this is not true today. Amsoil uses a lot of Mobil PAO (group IV) as the base stock for their extedned drain and high performance oils. It is the additive package that is their claim to fame.
On a somewhat related note I finally got a few clips of a crude experiment I did years ago on the web. It is not meant to be all encompassing, just of interest. The idea is to show cold (10-12F as acheived in my home freezer) flow properties 20W50 Dino vs 20W50 synthetic for all those who use 20W50 all year long.
YouTube - 20w50 Flow 10F.AVI
YouTube - Amsoil 12F Flow.AVI
Don