Not OP, but I'm going to guess confusion between "intake" and the hole in the valve cover where oil goes. I say this because I imagine the result of pouring it into the intake is a non-starting car, not a fire. Cars don't run on 10W-40.
I've never tried it, but I think my 1930 all-fuel tractor could run on 10w-40. I've run it on "it used to be gasoline 4 years ago", ethanol, and diesel.
I agree odds are intake means... oil orifice in this case. But I figure we're already in car abuse land might as well see how deep the rabbit intake goes.
Why come?
Feel free to put a few quarts/litres of 10W-40 in your crankcase, however.