Just to be clear there is a big difference (including price difference) between oils labelled as "Full Synthetic" and those as "100% Synthetic" as follows:
'Full synthetic (API Type III) is highly refined petroleum base with synthetic additives. The 100% synthetic (API Type IV) is formulated with a synthetic base and synthetic additives. You can go to the API website to see the type designations. You can also go to the Amsoil website to see independent testing to ASTM standards.'
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