Is Conoco oil company owned by Shell? I did some research on JD oil, and found that it is produced by Conoco oil company. At least the engine oil is. With the price of JD oil, and knowing full well that JD doesn't have any oil rigs, I figured I would just find out if there were any real difference in the oil in their bottles compared to oil in a name brand oil bottle. I didn't see any real difference so I started using Quaker State, the same oil that I have been using in all of my engines since I started mowing our lawn at home nearly 30 years ago. Only one engine through a rod; and believe me, it was that mowers time to go!