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...they will say proprietary. Yeah right. like it is a secret if you want to spend the $$$ a lab can get you a pretty good idea what is in the oil .
Audie Jumkie makes some good points; engineering matrix vs. performance or just playing around?
There are so many different chemical compounds in PCMO's that unless you spend over $1k for some expensive analysis, you would never know the actual makeup of an oil.
ANd unless you're just a copycat blender, it's best to develop your own formulations.
Some companies (such as Lubrication Engineers and RLI) even formulate their own additive mixes.
Each major oil company has a "stealth" ingredient that sets it apart from others.
Our past full synthetic PCMO formulations had various viscosity PAO's comprising about 60% of the formulation with additives, esters, and stealth ingredients comprising the rest.
Today, with majority GroupIII oils (approx. 65%), the PAO may be 5 to 10% with Group II and V, and additives comprising the rest.
With the quality and perfomance of current majority GroupIII oils, PAO's, esters, and AN's are almost considered as additives to adjust (Tune) viscosity, volitility, solubility, and oxidation resistance.
Each oil formulation has different percentages of base oils and additives.
And oh yes, let's not forget the new Gas-To-Liquid (GTL)technology that has the potential to produce an oil that outperforms GIII and GIV PAO.