Quote:
Originally Posted by m5james
All I know is that I learned my lesson when I accidentally put 87 into the tank of my 740iL. Granted, the engine isn't stock by any means, but the power difference was drastic...less power, felt like a brake was hanging, and lots of bucks and stumbles when I got on the pedal. I'm very ritual about using the Top Tier gases. Needed or not, i'll put cheap gas (Maverick, Shitgo, etc) in my Chevy, but the BMW's and motorcycle get nothing but the best. All these varying opinions about what octane is the best, but I'm in no position to question what a BMW engineer recommended is a safe min requirement for a $50k SAV. Maybe its a waste to some, but I'm not gonna risk it to save $5 every two weeks.
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Given the engine modifications to your 740 that you list in your signature, it appears that you no longer run the compression ratio or combustion chamber design that the BMW engineer originally designed into that vehicle, and so all bets are off on which gas to use. You will need to use the gas (AKI) which was specified by the engineer who designed the modifications.
I fully agree that using lower AKI fuel to save $2.50 a week is not much of a saving. Where I live, though, premium is $0.12 per litre or $0.50 per gallon more than regular, so it is more like $10 or $12 per week for many people. YMMV.
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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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