Yes, tilting could do it.
We have an olsd John Deere 1032. I think it's a Tecumseh 10hp engine ... that's seen some really hard use. Anyway, the thing doesn't burn a drop of oil after I started maintaining it.
Suddenly the oil level was low, really low. I found out my Dad had tilted it up when tackling some snowbank. Sure enough, I found the oil slick outside on the sidewalk where he had done it ... as well as the breather hole in the side of the block ... with a track of fresh oil still just below it.
I warned him about it, topped off the oil and the thing has been fine ever since.
You might want to look for a crankcase breather on the side of the block.
--- Bror Jace