I searched the Forums with some results to diesel suitability, ie XGK, and Whisperlite Intern'l
There are stoves that
can burn diesel, but be aware that diesel is a comparatively dirty fuel. If you're going to burn diesel in most camp stoves, you're going to need to clean the stove far more frequently than you otherwise would.
With regard to the two stoves you specifically named, the XGK and the Whisperlite Internationale, the XGK is going to be able to handle a heavy fuel like diesel far better than the lighter duty Internationale. I wouldn't want to run either stove on diesel for any length of time, but with the Internationale only when I simply had no other choice.
MSR's Dragonfly is also multi fuel. It will burn white gas, kerosene, unleaded auto fuel, diesel, and jet fuel. I have both the Dragonfly and the Whisperlite International - both good stoves. The DF is better for simmering and larger cookware.
The DF is a very stable stove, excellent for larger pots, but I would avoid diesel with it. The Dragonfly stove is the
most prone to clogging of all of MSR's production liquid fueled stoves.
Be very careful when you read on a stoves' box that it can burn things like automotive gasoline, AV gas, diesel, etc. First off, manufacturers are in the business of selling stoves. Second, even if the stove
can burn something like diesel, what is the impact of doing so? Most stoves will not burn non-standard fuels well and will clog more often. For me, I'd get a heavy duty valve-at-the bottle single-valved stove with a large generator like the MSR XGK. I would avoid valve-at-the-burner stoves like the Dragonfly and the Optimus Nova or small bore, medium duty stoves like the MSR Whisperlite. I want something simple, rugged, and reliable.
HJ