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Just curious...
What is semi synthetic formulation,
50% Pure Crude oil / 50% Group III or
50% Pure Crude oil / 50% Group IV




I can' remember the exact numbers but when i work for Aid auto they had a quaker state rep come in and go over this.

quaker state had few different semi synthetic at the time it went something like this.

quaker state 4x4 semi was like 80% crude and 20% synth.

quaker state high pofermance was the highest blend was like 70% crude and 30% synth

So i imagine from it ranges all over the scale with different brand oils