There's a number of references in the books to old oil being "reconditioned" by straining and letting it settle for a while. This reconditioned oil is shown in one example as giving a reduction in the number of hours per week required for maintenance of a vehicle for about a month.
Much of the lubricants in Europe has probably been recycled numerous times, disabled/destroyed vehicles drained and every last drop carefully hoarded. It's probably in an opponents best interest to disable rather than go for outright destruction, simply to scavenge the lubricants for themselves.
Down in the Middle East and over in Romania the situation is likely quite different, although my guess is the old lubricants are added to the crude and reprocessed. Every drop is valuable....
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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