Bill: Most consumers would never think to ask the question you did. Let me see if I can help with an answer. Equlion was a joint venture with Shell and Texaco. Chevron wanted to buy Texaco (mainly for the fuel end of it). Shell said okay, but we keep the formula's for all of the Texaco lubricating products. In other words, you can have the name, but not the product. I believe Shell has an agreement where they can actually package and sell the Havoline name oils for another 18 months. I might be a little off on the timeline.
Texaco use to have a diesel engine oil called Texaco Ursa Super Plus, that product is now called Shell Rimula. Same product, different name. It is my opinion the Formula Shell passenger car oil in now the Texaco Havoline formula.
Whatever product is made by Chevron is not the same as it use to be.
So the bottom line is, you have purchased Havoline, blended and packaged by Shell.
Ain't this confusing?