This is one thing I can be authoritative on. When I worked for a certain oil company, occasionally we would run out of diesel at the terminal.
When we did, we blended lube oil base stock (ie without additives) with JetA and sold that to the service stations instead. The lube oil base is necessary to provide lubrication in the injector pump and injectors. My guess would be around 5% - 10% lube would do it but I'm not sure. Best bet would be adding lube till the color matches diesel.
As for the Toyota turbo diesel, apart from the disintegrating turbo wheel, watch for the loss of power and big cloud of white smoke. That means the turbo oil seal has gone and the engine will happily continue to run, drinking its own lube oil until it dries out and seizes - it won't switch off with the key, you need to put it in fifth, stand on the brakes and drop the clutch to stall it to stop it.
If you don't $13,000 for a new engine. If you do, about $2,500 for a turbo rebuild....been there, done that.