Final answer:
The pressure at the halfway point in the oil increases due to the weight of the oil above this point as described by the hydrostatic pressure equation.
Step-by-step explanation:
The change in pressure at the halfway down in the oil is likely to increase. As you descend through a fluid such as oil, the pressure increases due to the weight of the fluid above. This is described by the hydrostatic pressure equation, P = ρgh, where ρ is the density of the fluid, g is the acceleration due to gravity, and h is the height of the fluid column. In the absence of other provided details, assuming standard conditions and a uniform fluid, as you go halfway down in the oil, the pressure has increased from the top due to the additional oil above this point exerting pressure.