The PQIA is an independent testing organization, non-biased. You can take their test results to the bank.
Originally Posted by ghorn
They provide tables of comparison between various oils, and their Mobil 1 chart indicates better NOACK testing results (volatility) for Mobil 1 than Amsoil . They don't list Redline I don't believe.
Here's a link that may prove informative: http://www.pqiamerica.com/March2013P...sallfinal.html
The Amsoil OE lubricant tested in the link above is Amsoil's cheapest lubricant, and is known to be cheap group III hydrocraked petroleum. It compares to the current formulation of Mobil 1. Amsoil sells OE for less than $5.00 per quart to preferred customers (online members), what you should pay for cheap base oil.
However, Amsoil Signature Series 5W-20 has a NOACK of 5.5%, almost 50% lower than anything Mobil 1 formulates. Why, because it's a true PAO/Ester synthetic base oil, not cheap hydrocracked "highly refined" petroleum.
Amsoil Signature Series 5W-30 - 6.9%
Amsoil Signature Series 10W-30 - 5.3%
Want to know what people should fear. The fact that big oil companies omit this specification on all of their spec sheets. Why, because they are hiding the truth. This one spec alone reveals base oil used in the formulation. You are not getting a true "fully" synthetic base oil, yet still paying the price for it.