oil injection or not, is a non issue....mix happens before it gets to carburetors and/or injectors... as for a "dry start" it is to. oil doesn't dissipate while settin' like said.. if it did just think about all tha rust that would form in tha cylinders, bearings and crank.....
a little is normal with some motors but if its more than that ya may have a "float/needle n seat, leaky injector problem......
runnin' it till empty has been debated since "day one"....your choice...
motors "just set" everywhere, private and dealerships....very few do any more than addin' fuel/oil and runnin' 'em when tha time comes