Last week, seven years after its last cleaning, I removed and cleaned the TBI of my 1994 Opel Kadett (here in Brazil), which had run exclusively on E100 (95% hydrous ethanol + 5% water) its entire life (31 years). I didn't take any photos of the process, but the TBI looks just like the one below.
After cleaning (or even before), the TBI looked like a completely new part, with no signs of corrosion. You can see that the two screws holding the throttle valve are copper, and receive ethanol directly as the injector is located in the compartment above. They are still in perfect condition with no signs of wear.
I also replaced the fuel pump as a precaution (it's a relatively inexpensive part), as it's located outside the tank, but it still worked, having been in use for seven years.
The entire fuel line, tank and ful regulator are also original. I only replaced the injector (also seven years ago), as the original Delphi was experiencing fuel delays during rapid acceleration; this car uses only one injector. I still have the original, which also shows no signs of corrosion. Since it's hard to find a shop these days that can calibrate this injector, I'm keeping it in storage to try to restore it, as it's no longer available new, and the aftermarket are garbage.
Regarding engine wear and the fear of the oil film being removed from the parts, especially the cylinders, I think I'd be having oil consumption problems after 31 years. But that's not the case, as I change the oil every 6 months/3,000 miles and don't even consume 100 ml during that time.
I know that using ethanol has its drawbacks, but I think that applies to any fuel. I wouldn't recommend it for those on short trips or for use in boats that sit idle for long periods, or even in very cold places. But if the material is designed for it, I don't see any problems with continued use.
As
@RDY4WAR said, ethanol evaporates easily from the oil, and every change I make every 6 months feels like new oil coming out of the crankcase, just use the car correctly and heat the lubricant.
I only use the car once or twice a week.
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For small engines I just use the pre-made stuff like he showed or regular E10 87 in my mower, seems to work just fine. I make sure I run it dry before winter and never have any issues.
