Hi Dean.
I have checked my source conserning ultraviolet exposure.
Turbineoils has this ability to turn brown due to ultra, and this chemical reaction is almost instant. He said flightmeckanics use a ultraviolet lamp to make turbineoil brown, to detect oil-leaks.
If brown turbineoil can be connected to bad lubeability, is still not comfirmed. But I`m working on it. I`ll check whith a
lab soon( tomorrow).
As not only one, but two engines broke down in two days, there must be some correct in this. The fuel was only five moths old, stored in a garage / basement on a semi-transparent plastic can, and during wintertime.
The restrictors were fully open, checked the same evening, and the fuel was dark. How dark is hard to tell, as I don`t know how dark it can be. Lets say the colour was clearly changed.
The oil used was Turbonycoil 3 centistoke.
So how will you explain what happened? What are the possibilities?
I`ll be back as soon as I have contacted the lab at Statoil.
Se ya then.

Gudmund