Quote:
Originally Posted by mrpcar
Curious Porsche uses the same Bosch injectors but don't have the same issue. My conclusion is that part of the fuel system BMW used is sensitive to ethanol and it's melting and breaking up and causing the injectors to get clogged. But it would cause them millions to do a recall to replace those components, so it is cheaper just to replace the injectors when there is a CEL..
My conspiracy theory...
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Decent theory but I don't think it's accurate based on my experience. I exclusively use Shell V-Power which, in Canada, contains no ethanol. Other premium gasoline from other companies usually have the "contains up to 10% ethanol" moniker on the pump, but Shell is for sure ethanol free.
I guess that leaves a couple other potential causes - the detergents the companies are putting in the fuel that act as supposed cleaning agents are causing the injectors to get gummed up; or, the injectors themselves are a bad design. I'm going with the latter.