You Can Has A Custom Title!!
Join Date: Feb 2004
Location: St. Louis, MO ||| Los Angeles, CA
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Honestly, for the extra 10 cents a gallon I would just use 93. If it's recommended, it's done so for a reason. It's just one of those things in which you have to be confident in your decision about using th eproper gas and sticking to it. Of course a dealership is going to skimp here and there when they can. They use 89 because it is cheaper.
The fuel with higher octane usually contain more energy per unit measure. I could go into the significance of how different octanes and their similarity to % heptane act independentaly are, but I don't remember high school chemistry.
Also, different regions use different scales for meansuring Octane. Us being Americans, we have our own way (because we're smartasses like that). Europe I believe uses the RON method for measuign octane, versus the United States which uses the average of the RON and MON method, often seen as (R+M)/2 at gas stations. Now what the dealership told you may have been true of consider 93 octane Europe as 89 Octane here, if only they realized that our manual were made for America, and i'm sure our manuals recognize that in America the octanes are listed as the (R+M)/2 method. Did I confuse that? What im saying is 93 octane Europe as RON could be 89 octane (R+M)/2 here. Simply put, check your manual, if it says somethign about the rating system liek ROn and MON or (R+M)/2 then it is meant for US spec octane. If it doesnt mention any of that, assuem it's made for US Spec cars.
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1995 BMW M3 Turbo - Dakar/Black