That is why the phrase "ABP" was common when I was a kid. It meant "anything but Pennzoil" when calling for a brand to use at oil change.
The difference used to be significant as Pennsylvania crude has a high level of paraffin. So oils refined from Pennsylvania crude (including Quaker State) were said to cause tons of sludge, and some of that criticism was deserved.
I am told that the refiners now mix many types of crude so the paraffin of Pennsylvania crude is diluted. Maybe, but I still tell my mechanic to use ABP.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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