DERG - I'm having a hell of a time following post #88.
Firstly - Aircraft engines must burn a variety of fuels. Within the Jet A spec there is a range of specific gravity, a range of Hydrogen content, thus a range of LHV (BTU/lb) that must be accommodated. Add or subtract a bit of turbine oil, and the fuel/oil properties change very little, compared to the variation that already exists in the Jet A spec. In addition, engines are often approved to run on other fuels - Jet B (higher volatility for arctic use), etc.
Now then - at TO the engine is gulping a few dozen gallons of fuel per minute. The total oil tankage is only a few gallons. IF THERE WERE ENOUGH OIL ENTERING THE COMBUSTION CYCLE to make a measurable difference, the engine would start to overboost. Now what will happen?
The governing function of the fuel control or FADEC or EEC will trim back fuel delivery to bring rpm back to target!
So you see my dilemma: First - how will engine oil at a few dozen psi find its way into the main gas path (several hundred psi), and Second, how could this create overspeed?