This is an open Forum and anyone can post. People may not like every response but that is the nature of forums. As long as there is no name calling or off color remarks no harm no foul.
@Cavell is correct, checking the oil once a week is good practice. Your husband checked the oil and said it was OK but needed 3 quarts the next day. If you run an engine 3 quarts low you might as well use the engine for high powered rifle target practice. The end result is the same. Keeping the oil level full is the easiest and cheapest thing you can do to keep an engine running a long time. Oil is easy to check and cheap to buy (compared to a new engine) The average car takes 5 quarts of oil, 3 quarts low leaves 2 quarts to handle the load (40%). The average adult human has 1.5 gallons of blood, imagine how a person would feel if they lost 60% of their blood (almost a gallon) leaving 40%, I am not a medic but I think that person would be having a very bad day.
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At any rate if it lost three quarts of oil in a couple days, the problem is not the engine shutting off but rather why it is using or leaking that much oil. Monitoring the oil level probably daily and looking for leaks is called for. If its using that much oil, then there is something very wrong with the engine.