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Originally Posted by GoBlueBMW
Hey, I live in southern California (Los ANgeles Area) and I cannot find a gas station with over a 91 octaine raiting....Does anyone know perhaps why? Does anyone else know a specific place to get over 91 octaine? Also, somone mentioned they get Mobil 93, but Mobil isn't considered top tier....
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That's because 99.9% of daily driven cars do not need anything higher than 91. You can do just as much harm by putting in too high an octane as you can too low an octane. The E90 should take 91, nothing more and nothing less. You can get away with 88-89 occasionaly though, but it's best to stick to 91.