[pdesanctis]

Originally Posted by NavyDood

Actually yes. Base oil is just that, the base. It could be hydrocracked dino (Group III), PAO (Group IV) or Ester (Group V). A group III has the similarities of a true synthetic but it is still dino oil where groups IV and V are chemically engineered. The additives are what gives the oil it's capabilities and longevity. Some additives that are being used in Group III oils now have a splash of PAO or Ester. The biggest reason for this is to get the cold pour point at a lower level than what a Group III can give you. Depending on the strength of the additives, those additives will determine how the oil will hold up from breaking down, keep contaminates in suspension, maintaining viscosity, reduce acids and reduce moisture. Those are just a few of the things the additive packages do for the oil.

You must be on Bobistheoilguy often

as am I.