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Off Topic Response
Quote:
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Originally Posted by Hunter
I thought both engines required premium. Could I be using reg. or mid. grade in my 3.0?
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Well, the premium being referred to is a price premium, not premium fuel.
To balance out AZNm's post:
The short answer: Yes
The technical answer: It will not hurt your engine. It MAY cause reduced power, and increased fuel consumption, depending on the actual fuel quality in your area, and your ambient conditions. The only way to know is to try it. If you notice any deterioration in power or fuel consumption, it is a pretty good bet that the ECM is retarding the timing to prevent predetonation; in that case, you should go back to premium fuel and get all the performance you paid for. I used mid-grade (89) for years with absolutely no adverse effects, but did notice a power drop on 87. That said, you won't save much in annual fuel costs, and many will slag you with analogies such as tinned food for athletes, don't buy a BMW if you can't afford the fuel, it isn't a Honda, etc. 
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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