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I am up in Illinois and Shell has actually been pretty competitive. Been using it since I got the 1er last year. The other day I put BP in the car, 93 Octane of course, and yesterday the engine was mis-firing badly. Called the dealer and he said they have had a lot of cases of bad gas, and recommended I switch the gas to a high tier gas brand and see if it happens again. I got no Check Engine light and upon restarting the engine the problem was gone.
I just filled the car with Shell 93 with Nitro(gen) and will see if the problem re- emerges or not. Anyone else have a 135i with a rough running engine problem?
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