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E36 /7 Z3 (1996-2002)
E36/7 Z3 roadster and coupe talk with our gurus here.

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  #1  
Old 06-19-2011, 08:58 AM
planetech planetech is offline
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z3 gasoline type

Just a quick question. Does the z3 is using premium type gasoline only or unleaded also? thx
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  #2  
Old 06-19-2011, 11:58 AM
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Steamer Steamer is offline
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Premium is unleaded, I think your question is about octane level, I know my m is premium, not sure about non-m but I know every BMW I have owned wanted premium gas put in, even my old 325. Check your manual, I bet yours will call for premium.
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Old 06-19-2011, 02:54 PM
Giznaz Giznaz is offline
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Quote:
Originally Posted by planetech View Post
Just a quick question. Does the z3 is using premium type gasoline only or unleaded also? thx
Welcome to the crowd. Where in Zeattle are you?

If you have an //M, likely premium gas, 91 octane.

For about anything else, the mid-grade works just fine. I tend to get the Arco 89, as it's cheaper than about anything else
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Old 06-19-2011, 08:24 PM
Jim in VA Jim in VA is offline
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I use non ethanol gas. If you go to puregas.org you can get a listing by state of stations that sell it.
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  #5  
Old 06-20-2011, 03:09 AM
Mikey48 Mikey48 is offline
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It cost a little more but your car will always run better on premium gas.
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  #6  
Old 06-20-2011, 04:01 AM
MartzMimic MartzMimic is offline
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In my E90, I get a couple more mpg using premium. 91 is generally 20-22 cents higher (about $3.50 a tank for me) and it's about $3.50 a gallon here now, so it balances out. Plus, you get better performance.
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Old 06-20-2011, 07:32 AM
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I went into the BMW site and could not find anything recommended other than premium gas. I know you can use a lower octane and save money, but you can also put lower grade oil in to save money. Not sure to what extent you want to go to save money, 87 octane gas will work, but the manufacture recommends premium as the higher octane gas is what these engines are designed for. Lower octane can cause some engine problems and a decrease in performance.
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Old 06-20-2011, 05:59 PM
Jaybrad Jaybrad is offline
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I wrested with the whole "what octane" question and decided to run the mid grade (89 octane) for a few tankfuls and compare the results to premium (91 octane). My driving style was the same as were the conditions. I consistently got about 30 mpg which is 10% better mileage with premium, and it only costs about 10 cents more per gallon (2.5%).

My seat of the pants evaluation was that the performance was also better, but that's very subjective.

So I went back to premium, and try to buy it from a station with a better likelihood of having fresher fuel, too.

Interestingly, I did the same test in my Saab 9-5 and got about the same mileage and minimal performance difference so I stuck with the mid-grade.

But as the man on TV says, YMMV.

Good luck,
JB
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Old 06-21-2011, 04:41 PM
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seth1993 seth1993 is offline
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Mid grade is what the manual calls for, but with my tune premium.
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