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Old 09-02-2011, 09:12 AM
bimmerteck bimmerteck is offline
BMW Magician
Location: Nashville, TN
 
Join Date: May 2011
Posts: 373
Mein Auto: e30 M50ish
It isn't the ethanol itself that causes issue with seals as much as it is the drying agents they add to it b/c ethanol in it's natural state absorbs water. The upside is that it cools combustion events and allows for higher compression, downside without modifying your compression ratio and writing a new tune for your DME you can't truly take advantage of it so it will show up as decreased fuel mileage and reduced emissions.
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