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      01-09-2013, 12:19 PM   #12
The X Men
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Drives: 2013 X3 35i
Join Date: Mar 2012
Location: MA

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Putting in low octane gas for 36 months will not damage the car to the point where it will need service, I have seen many people done it. My brother put in the cheap stuff in his BMW for 5 years with no ill affect except some lost of power and smoothness.
BMW recommands premium gas because their advertised horsepower, gas mileage and torque numbers are generated with premium gas. I do believe there is some truth to getting better gas mileage with premium gas if your car is design for it such as the F10, but not to the point where the gas saving will offset the additional cost.
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