One of the most general cause of low fluid is that the liquid leaks from a point in the system .
To find this sometimes the car repairman will pressurize the system to be able to reproduce where the system leaks .
This way they can see better where is the leak and fix it .
The second possibility is that the liquid gets warmed up causing evaporation and a low level reading over time .
The most probable cause is combustion of a rich mixture of fuel.
more probable most probable
if is model with computers etc,most probable cause is the cam positioning sensor
You think probable to the role of electrons.
High cholesterol levels, and not enough exercise.
Acid rain most likely.
She died suddenly of somewhat mysterious causes aat home. Drug overdose seems the most probable cause.
V_mp (most probable speed) = sqrt(2KT/m) where K is the Boltzmann constant
The most probable cause is poor fuel or water in your fuel. This could also be due to the timing being out of proper adjustment.
Syphylis
Most commonly diet.
This is most likely a severe failure somewhere internally in the engine that resulted in coolant in the oil. different root causes are probable. oil should be checked regulary (do a oil sampling) after it has been replaced.