I’ve put on 140k+ miles on my 340i and still drive it with an E40 custom tune whenever I can manage to fill up. I’ve never heard of any major injectors getting stuck issues other than on some V8s but that’s pump gas even stock cars have it happen. Your tuner is most likely right and it has nothing to do with ethanol let alone his tune. Injectors on these cars are nothing new. They’ve been used for a long time now.Just a word of caution guys, With E85 it really is not a matter of if but when you develop issues.
I managed to run it for 5-6 weeks on a S55 platform, also one of the mentioned tuners here and 3 injectors got stuck causing 3k + worth of repairs. The tuner of course swears it has nothing to do with a tune Or E85 but he would swear wouldn’t he, e85 is his bread and butter and everyone is jumping on this bandwagon.
Fact is I did the same thing, browsed forums decided to do the tune and very quickly regretted it.
Btw all the cycling of fuel etc that’s recommended I did properly, everything was done right but doesn’t matter.
After this and more research I realized that almost all injector issues mentioned on forums are E85 related.
I am back on 93 running a stage 2 tune and no issues whatsoever with the car... so if you really want to daily drive e85, you can do it... but it’s a big gamble and there’s a HUGE chance you re gonna have to deal with some negative consequences.