Also don't forget that a lot of 'display' Tanks, Cars, and aircraft generally don't have oil in them and quickly end up with the engines becoming a inert hulk. Go to a museum and look under, say a airplane and look how many have oil pans below them. If they do there taken care of and have a working engine. If not either the engines a hulk or its not there at all. And a lot of display tanks lack there engines which are pulled and either scrapped or used in something else.
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