1,6,7,8 - Series and Mini CooperGeneral Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.
I'm leasing a X3 2005, and have been putting 91 octane gas since the first day.
recently, a friend of mine told me that 89 octane will do as well, since if am not interested i buying the car after the lease, why should i care??
my question is:
do you guys think is this a good idea? i mean, i know that the manufacturer recommends 91 octane, but I am wondering whether there is any serious impact on mechanics, performance of the car.
Originally posted by Bear@Jun 18 2005, 12:22 PM No major mpact except to your wallet and if she needs 91 and you use 87 the knock sensor will retard the timing if pre ignition occurs and you will lose horsepower.
once again, thanks for your clarification.
I don't see much difference between any of the octane levels. Not exactly the autoban around here. I'd love to take the X somewhere I could legally open her up. I always took my 2002 for a 80 mile full throttle drive when I had it but I was part of the "Get Out of Jail Free" club then.
Higher octane gas burns slower. This is a benefit in high-compression engines especially, allowing for more even-flowing combustion and decreasing the possibility of the fuel blowing up before it's supposed to. Your BMW has sensors ("anti-knock sensors") that will detect if that's happening with the lower octane gas and adapt to it; however, it won't run like it could--it'll have lower horsepower, and from my experience in my 528, noticeably lower.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.