Do you mean; can I throw in some 30W in my engine if I can't buy 10W-40? If there is nothing else available and you need it to run your car, then you can temporarily substitute *any* weight of automobile motor oil. You can even wait until your next oil change to put it back to 'normal'.
Do you mean; Is there a tolerance set forth by the SAE for viscosity ratings? If that is your question, you'll have to consult the SAE website.
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