What I find interesting is some of the negative perceptions surrounding certain brands. Pennzoil seems to be one of the more polarizing ones. I've heard more than one person say Pennzoil is no good as it's very waxy and prone to sludging because of the Pennsylvania crude it's made from.
You know, because Pennzoil has been making oil the same way since 1976. Only Mobil and Castrol have made improvements to their oil. Everyone knows that!
Marketing of motor oil fascinates me. I have a marketing degree so I get geeked about this kind of stuff. It's remarkable that the space devoted to motor oil at Wal-mart is almost as large as the space dedicated to beer or soda. The difference is that soda and beer, even similar kinds, can be differentiated relatively easily, and a preference formed, by the consumer simply by tasting it.
Motor oil is not so easy. The overwhelming majority of vehicle owners will never cut a filter open or have a UOA performed. The only way they know their oil is working is because a rod hasn't blown throw the side of the engine.
So how does someone choose an oil? They use what their dad used. They use what their favorite NASCAR driver has sewn to his Nomex pajamas. They use that environmentally friendly oil in the green bottle to save Mother Earth. They buy the one that says TRUCK on it because they drive a truck. They buy the one that has that neato display at the parts store with the two cranks and the gears inside. They buy the cheapest one. They buy the one they heard of because the manufacturer advertises the heck out of it. They buy the one their gearhead brother-in-law said to buy.
And a statistically insignificant few make their choice based on science and data (or their perception thereof).
How many vehicle owners in this country change their own oil? I'd be surprised if it was more than 15%. Of those, my guess is less than 1% of that 15% have been to this site or a similar one.
How much motor oil is sold to DIYers versus what is sold to dealerships, quick-lube joints, and fleet operators (UPS, municipalities, etc.)?