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FairAndUnbiased

Brigadier
Registered Member
From what I understand ethanol makes rubber components and gaskets in the engine and fuel system degrade faster.
NBR is the typical material for engine gaskets, and it is indeed incompatible with alcohols.

I think the tough challenge is dynamic seals. NBR works for rotary seals because it is wettable by oil, while other more chemically inert seals like fluoropolymers are not wetted by oil, making dynamic seals suffer high wear.
 
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