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In the past there definitely were rules on the adding of oil -- it was generally a minimum distance that had to be covered between fillings, in the 20-or so lap range usually. The oil filler was sealed and no end of problems over the years due to seals being inadvertently broken by the officials.... Not sure if the rule ever went away since it was there for eons..... Also, there were once restrictions on the minimum distance between refuelings -- which was not the same as the one on adding oil, naturally...
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