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.
Sure they do. Not very well, and you mix it with gas, but they will run. 2 cycle engines sometimes run 16:1 ratios of gas to oil (an engine old enough to run 16:1 was speced before modern two stroke oils and so they meant regular engine oil - though oils then were very different from modern engine oils). Up until the 1980s a car with more than 70,000 miles on it could be assumed to burn a quart every few hundred miles.
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.
Well the comment about it "burning a lot of oil" could also be attributed to splashing some oil in the air intake. And it might eventually leak somewhere hot enough to burn.
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.
Ironically, if the OP had used straight 30w or 20-50w it would have run out of the car slower causing the car to take longer to catch fire because of less buildup of spilled oil.
