That "injector cleaner" stuff will usually not hurt any engine. Because it is really not effective in any way, doesn't clean....doesn't damage....it's so diluted in a full tank of fuel.
The rich oil companies love that some people become so loyal to their product claims. Heck, I know people who buy new cars every 2-3 years and STILL faithfully buy hundred's of dollars (if not a thousand) of specialty petrochemical products on a vehicle they'll never keep anywhere near long enough to realize the promised benefits of the spendy products they put in their tanks.
I put 300K miles on a 5th Gen 3.5 V6 Maxima feeding it the cheapest brand of fuel (but used premium for max power/mpgs) and that car, in that entire time, ran perfectly except for a bad cam sensor at 192K and a failed door lock motor at 297K. Also only used regular dino oil in it. The only thing I did was use quality oil filters and regular fluid changes (on an extended schedule, however).
My Nissan Titan is 15 years old soon, it too has been treated the same as the Maxima....I even dump old fuel that is beginning to smell varnished from my lawn equipment and boat into it. Seems to love it, actually!