While I agree with IndyJay, I don't expect to have any such issues. The reason being is that it's far more likely that non-corporate-use diesel equipment will be made illegal before we even get to possible doomsday situations*. If not, then an outright economic collapse (all empires collapse- US-centric comment, but note that such an event will likely be global) will occur and all bets are off as to whether our expectations even come close to mapping to any such reality.
* Trust me that I don't take/make this/my statement lightly. I've got plenty of diesels (and dependencies; some mitigation pieces, but effectiveness cannot be predicted owing to the fact that the future isn't what it used to be).