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Old 02-18-2010, 05:27 PM   #1
2009 328x Auto 6spd
Join Date: Feb 2010
Location: Toronto
Posts: 1
328xi - Automatic gear transition is not smooth when driving slowly

I just recently got my first BMW (328xi, Auto 6 Spd, Brand new) and have the following questions..
1) When I drive slowly in traffic (0 to 40Km/h), automatic gear transition is not happening smoothly; I could almost feel the impact while driving; However this is not happening when driving above 60Km/h. Is this a known 'behavior' with 328 Automatic? or anyone experiencing this?
2) what are the short/long term impact should I expect if I change the fuel from Supreme (Octane level 92) to Extra (Octane level 89)? Is changing the fuel to regular and/or extra?
3) Any tips for winter maintenance (eg. alloy wheel protection, exterior cleaning, underneath coating)

Thank you in advance.
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Old 02-19-2010, 02:33 AM   #2
A.K.A. crossfire291
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Join Date: Feb 2007
Location: Chatham
Posts: 2,044
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Don't know about the transmission thing...but

2) Don't know about the long term impact, but you should follow BMW's recommended octane rating. The engine is rated, what it's rated at for a reason. It has to do with engine compression. If you put 87 in an engine that is rated for 91, you may almost right away experience engine knocking. The engine knocking is due to "pre-ignition" in the cylinders, which more than likely may cause...... undesirable effects down the road.

3) I try to clean my car once a week at least. It's also a good idea if you plan to keep your car for several years, to have the car coated in and out with a winter coating of some sort.

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