WMO will produce less power and MPG than diesel in our trucks. There are other threads on here where members reported the exact thing you have described on here. They went to WMO and noticed a reduced amount of power, switching back to diesel and the power returned. I don’t think it is the viscosity. But read further....
For discovering it on your own, you could test your viscosity and you will obviously see that oil is thicker and diesel. no doubt about that. But to get a real idea, try to find the amount of energy that is in motor oil and compare that to the amount of energy in diesel.
Ok so using google,
1 Gal of #2 Fuel Oil = 139,000 Btu’s
A typical gallon of waste motor oil contains 153,000 to 180,000 BTU per gallon
So this says the opposite of what I have said. Maybe I am wrong (first time for everything )
I wonder if the FDC is the culprit here. If someone runs WMO without the FDC we could make an assumption on its hand in the matter.
Perhaps the pumping loss is significant with thicker oil. But to imagine a noticeable difference, even with a fuel that has a higher BTU, would be saying a lot about the pumps efficiency or the fuels thickness.
More thinking... it was described to measure viscosity above using flow time. Even under pressure, flow time will still change with the thickness of the fluid. Maybe, the timing needs to adjust with the fuel change to take advantage of the fuel. It could be that LESS WMO is injected because of the amount of time allotted for the injectors to push out the fuel. ... If that case, wouldn’t that mean you are using less fuel? Maybe you aren’t using enough fuel to make the power needed and its causing the reduction in power.
