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Re: Fuel (archive)

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Posted by Scott on November 08, 2000 at 18:27:30:

In Reply to: Fuel posted by Steve Bullock on November 08, 2000 at 15:20:13:

If the rough running is excessive, I recommend you speak with the service manager at your dealer. You may be asked to leave the vehicle to help them duplicate the problem.

As for fuel, there seems to be a fairly widespread misunderstanding of the relationship between octane rating and performance. The higher the octane rating, the slower burning the fuel -- this is desirable (and necessary) in high compression engines to prevent pre-ignition. Lower octane (more volatile) fuel in a high compression engine will tend to ignite far too easily and result in pre-ignition and/or detonation. Using a higher octane fuel than specified by the manufacturer will result in poorer fuel economy, lower power output, and an excessive drain on the wallet. Don't be mislead into believing high-octane always equals high-performance. That statement is true only when the engine is designed to burn high-octane fuel.

Just got a 1998 z3 for birthday. Wife handled whole deal?? After sitting for a few days it starts and runs rough for a minute or 2. Any ideas? i was thinking that the dealer may have filled up with 87 octane to save $$ on the deal. Could this be the problem? Filled up with 93 just too see but no miles driven yet. Pls help before i go to dealer and make a fool of myself.

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