Your best bet would be to stockpile as much high grade synthetic as you could then drain and filter with a good centrifugal system. Even then you'll eventually deplete the additive package. 100 years ago it made a big difference what kind of crude you started with, hence all the old ads mentioning "Pennsylvania Crude".
You might could use Castor oil too. Not sure how well it would work by itself in a modern engine. I believe some of the high end 2 cycle oil either contains or is made largely from Castor oil. I haven't really looked into it but I know they used it in early aircraft engines.
If you're looking at a large scale collapse of societal underpinnings then lack of replacement parts and raw materials are going to bring pretty much all machinery operations to a crawl. If you're prepping then the best plan is to start now with learning how to train and use an Ox team. You'll be ahead of the game.
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Today's Featured Article - Usin Your Implements: Plow and Disc - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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