If concerned about lack of lubrication with modern low sulphur diesel (a valid concern, especially as in 'some places' low sulphur central heating oil
can be sold as 'diesel'), I have found marine
synthetic two stroke oil
works very well for essential injector pump
If in doubt, I add it at a 100:1 mix ratio, and it may even work well enough at 150:1 (I erred on the side of caution after a friend had his injector pump
blow due to lack of lube, until a more dependable supply was available).
You can usually pick up heavily discounted two stroke in end of season sales, and non marine
(e.g. chainsaw synthetic two stroke) should work well enough as well, though I do like the idea (perhaps unreasonably) of lower temperature use formulations perhaps being better suited.
Wrecking injector pumps is not a hobby I seek to get interested in.
PS that flashpoint graph looks deeply suspect to me.