Petroleum Quality Institute of America : 17 synthetic virgin oil analysis results

[Hershey]

of 5w-30 oils . http://www.pqiamerica.com/March2013PCMO/Marchsyntheticsallfinal.html .

[Hershey]

Here's an V.O.A. of the AMSOIL Signature Series synthetic 5w-30 S.N./GF-5 for comparison to the other syns . http://www.pqiamerica.com/2012%20April%20results/Amsoil.htm . Very impressive .