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Cars need to be setup for ethanol.Agreed there are definite limits to it. Turning waste into ethanol is sensible, it saves oil and puts the material to good use, but growing crops for that purpose specifically is highly dubious.
My point however is that done properly it won't wreck your engine but many seem to have a view that they'd rather walk than put E10 in their car. As far as they're concerned it's the devils work when in truth there's no such problem if it's done properly.
There's far too much of a religious / emotional / non-scientific approach to the entire energy issue in my view (referring to society as a whole there, especially politics).
O rings on fuel lines pumps etc , plus the lines them selves need to be ethanol resisant .
O rings and lines made from natural rubber, butyl or Nitrile are highly resistant to ethanol, but both natural rubber and butyl are poorly resistant to petrol.
Silicon andNeoprene are not so good with ethanol, but unsuitable for petrol.
Nitrile works well with either.
Cast Polyurethane works well with gasoline, but is bad with with ethanol.
Newer cars are likely to be using Nitrile, older cars you never can be quite sure until they fail.
Mick