100% special brew (well it was showing empty so maybe a gallon of pump diesel in there).
Americans have been changing their engine oil and tipping the used stuff into their tanks for years. With CDI engines and the like they are getting a little more dubious of the whole idea but I speak from experience where it concerns 2.5NA and 300tdi's, single cylinder petter engines and even a lawnmower!
The oil on its own would in most cases be too thick, this leads to over pressurisation in the IP and can have an effect on the injectors because its just too thick, also its not that great at auto ignition.
Oil has LOTS of energy, but a low cetane rating – its auto ignition factor; so its ability to explode into flames when compressed.
Kero, apart from running planes and heating its also used a lot as a solvent, to clean parts and degrease, so that tells you something and its properties. It's thin and would offer NO lubrication to the injection pump. It does however have a high cetane rating.
So mix the two and you end up with a viscosity similar to diesel, a high enough cetane rating and generally a very good fuel (probably not from a green point of view as your “burning oil”
.
If you don’t have access to kero then you could experiment with petrol.
It also makes buying engine oil less expensive as you can consider that when you get every litre of it back out the sump it saves you 95p.
Use a little extra kero in cold weather like we have seen recently.