Quote:
Originally Posted by mainbearing
I heard it is not the engine but the fuel delivery system components as ethanol attracts water and the result is corrosive?
|
Although I do not have any direct experience regarding this, my understanding is similar:
If the fuel lines (and associated parts) are made for normal fuel, the ethanol degrades the rubber/plastics of those parts at a higher rate as compared to normal fuels.
In other words, the fuel parts should be "E85 approved/tested" in order to have normal reliability.
Update:
Looks like fuel systems in the N54/N55 engines are most likely okay...
https://www.bmwn54tuners.com/%E2%80%...thanol-blends/
"Does your BMW have stainless steel fuel lines? There are also debates on whether or not e85 will degrade fuel lines, seals, etc. To be on the safe side, I would recommend having stainless steel lines and injectors. Most newer, turbocharged, direct-injected BMW engines feature stainless steel lines and injectors that will not be affected by ethanol."