Split this into 4 questions:
1. Who refines/synthesizes their own base stocks?
2. Who completely makes their own additives?
3. Who buys additives in bulk from outside suppliers and blends it themselves?
4. Who just gets all the completed oil externally and plasters their spiffy name on the bottle? (i.e. PistonKing)
Haha, you go dave! This place is teeming with trolls lately, eh?
I was genuinely curious if any one manufacturer did the whole process start to finish themselves. .....
ram_man, Nevermind the mental nut-jobs like SteveSRT and dave1251 who often do this.
Certainly Mobil, Shell (Pennzoil, Quaker), and Castrol formulate their own oil. Possibly Chevron (Havoline) as well to a high degree. They specify what they need, then have some in-house patents to draw from, and the rest they buy from Dow, Monsanto, Noria, etc.
Its important to note there is no real market advantage in exceeding oil performance specs (SN/GF-5/dexos1/HTO-06/etc.) a particular oil is marketed for, making it easy to just take up the offers from Noria, Lubrizol, or Afton to contract out a formulation completely that qualifies for a spec you want. Thats likely what SuperTech Warren oil does, as just one example.
maybe irving but you might need to buy as close to their rafinerie as possible given corp tend to trade with each other when distance is becoming problematic
ps:yep it means when you remove the marketing mumbo jumbo ? any oil should perform well if it has the sae logo mentioning sn ,or cj-4 or acea blablabla (blablabla being the respective number for a given application)so bottom line?check out oil special and check the oil manufacturing date .once those two are within your acceptance range your covered .but there might be oil maker that do from a to z their own stuff